If you can ping your neighbor, this confirms that you don't have duplicate ip addresses. The next step is to check the K values but lets assume everything is left to default. You can then ping 224.0.0.10 which is the multicast address that all EIGRP routers should be listening to. If you don't get a response like i am getting below, then EIGRP is not enabled.
EIGRP ENABLED on the neighboring router:
R1#ping 224.0.0.10
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.0.0.10, timeout is 2 seconds:
Reply to request 0 from 192.168.2.2, 24 ms
Reply to request 0 from 192.168.1.2, 28 ms
R1#
R1#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 192.168.2.2 Fa0/1 14 00:28:35 41 246 0 28
0 192.168.1.2 Fa0/0 10 00:28:38 48 288 0 29
R1#
EIGRP DISABLED on the neighboring router:
R1#ping 224.0.0.10
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.0.0.10, timeout is 2 seconds:
.
R1#
Showing posts with label EIGRP. Show all posts
Showing posts with label EIGRP. Show all posts
Tuesday, September 18, 2012
EIGRP VARIANCE and OFFSET
R1 Variance Command:
Variance commands allows you to do unequal cost load balancing. Variance 1 is default which means equal cost load balancing. Variance 2 to 128 is unequal cost load balancing. This commands takes the FD from the best eigrp route in the topology table and multiplies this by X. X being the number specified in the variance command. We are going to take route 4.4.4.0/24 and unequal cost load balance it.
Before: You can see that we have two paths to reach 4.4.4.0/24 but the router is picking the path with the lower FD.
R1#show ip route
Gateway of last resort is not set
4.0.0.0/24 is subnetted, 1 subnets
D 4.4.4.0 [90/179200] via 192.168.2.2, 00:00:05, FastEthernet0/1
C 192.168.1.0/24 is directly connected, FastEthernet0/0
C 192.168.2.0/24 is directly connected, FastEthernet0/1
R1#show ip eigrp topology all-links
IP-EIGRP Topology Table for AS(10)/ID(192.168.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 4.4.4.0/24, 1 successors, FD is 179200, serno 12
via 192.168.2.2 (179200/128256), FastEthernet0/1
via 192.168.1.2 (409600/128256), FastEthernet0/0
P 192.168.1.0/24, 1 successors, FD is 281600, serno 1
via Connected, FastEthernet0/0
via 192.168.2.2 (307200/281600), FastEthernet0/1
P 192.168.2.0/24, 1 successors, FD is 51200, serno 9
via Connected, FastEthernet0/1
via 192.168.1.2 (307200/281600), FastEthernet0/0
R1#
After: You can see the FD is diffrent but when you multiply 179200*3, 4097000 is well within this range.
R1#show ip route
Gateway of last resort is not set
4.0.0.0/24 is subnetted, 1 subnets
D 4.4.4.0 [90/179200] via 192.168.2.2, 00:12:53, FastEthernet0/1
[90/409700] via 192.168.1.2, 00:12:53, FastEthernet0/0
5.0.0.0/24 is subnetted, 1 subnets
D 5.5.5.0 [90/179200] via 192.168.2.2, 00:11:29, FastEthernet0/1
[90/409600] via 192.168.1.2, 00:11:29, FastEthernet0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/0
C 192.168.2.0/24 is directly connected, FastEthernet0/1
R1#
Confirming the variance setting before and after the change:
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
192.168.1.0
192.168.2.0
Routing Information Sources:
Gateway Distance Last Update
192.168.2.2 90 00:00:37
192.168.1.2 90 00:00:37
Distance: internal 90 external 170
router eigrp 10
variance 3
exit
!
R1#show ip protocols
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 3
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
192.168.1.0
192.168.2.0
Routing Information Sources:
Gateway Distance Last Update
192.168.2.2 90 00:00:03
192.168.1.2 90 00:00:03
Distance: internal 90 external 170
R1#
Offset list allows you to inflate the FD of a route. You can apply this inbound or outbound. Depending on your needs.
Offset-list on R2:
ip access-list standard eigrp
permit 4.4.4.0
!
router eigrp 10
offset-list eigrp out 100
Before:
R1#show ip route
Gateway of last resort is not set
4.0.0.0/24 is subnetted, 1 subnets
D 4.4.4.0 [90/179200] via 192.168.2.2, 00:00:58, FastEthernet0/1
[90/409600] via 192.168.1.2, 00:00:58, FastEthernet0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/0
C 192.168.2.0/24 is directly connected, FastEthernet0/1
After:
R1#show ip route
Gateway of last resort is not set
4.0.0.0/24 is subnetted, 1 subnets
D 4.4.4.0 [90/179300] via 192.168.2.2, 00:00:05, FastEthernet0/1
[90/409700] via 192.168.1.2, 00:00:05, FastEthernet0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/0
C 192.168.2.0/24 is directly connected, FastEthernet0/1
R1#
Thursday, August 23, 2012
EIGRP Verification Commands
R3#show ip eigrp traffic - Self explanatory
IP-EIGRP Traffic Statistics for AS 10
Hellos sent/received: 81/81
Updates sent/received: 5/5
Queries sent/received: 1/0
Replies sent/received: 0/1
Acks sent/received: 5/3
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Hello Process ID: 208
PDM Process ID: 138
IP Socket queue: 0/2000/2/0 (current/max/highest/drops)
Eigrp input queue: 0/2000/2/0 (current/max/highest/drops)
R3#show ip eigrp topology - Shows you routes that made it into the topology table.
IP-EIGRP Topology Table for AS(10)/ID(3.3.3.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 3.3.3.3/32, 1 successors, FD is 128256
via Connected, Loopback3
P 4.4.4.4/32, 1 successors, FD is 307200
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 1.1.1.1/32, 1 successors, FD is 307200
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 3.0.0.0/8, 1 successors, FD is 128256
via Summary (128256/0), Null0
P 192.168.1.0/24, 1 successors, FD is 284160
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 192.168.2.0/24, 1 successors, FD is 281600
via Connected, FastEthernet0/0
P 192.168.3.0/24, 1 successors, FD is 284160
via 192.168.2.1 (307200/281600), FastEthernet0/0
R3#show ip eigrp neighbors - Displays the neighbors discovered by EIGRP.
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.2.1 Fa0/0 13 00:03:30 865 5000 0 8
R3#show ip eigrp topology all - You can see the routes that are not feasible successors
IP-EIGRP Topology Table for AS(10)/ID(3.3.3.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 3.3.3.3/32, 1 successors, FD is 128256, serno 13
via Connected, Loopback3
P 4.4.4.4/32, 1 successors, FD is 307200, serno 10
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 1.1.1.1/32, 1 successors, FD is 307200, serno 9
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 3.0.0.0/8, 1 successors, FD is 128256, serno 14
via Summary (128256/0), Null0
P 192.168.1.0/24, 1 successors, FD is 284160, serno 7
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 192.168.2.0/24, 1 successors, FD is 281600, serno 6
via Connected, FastEthernet0/0
P 192.168.3.0/24, 1 successors, FD is 284160, serno 8
via 192.168.2.1 (307200/281600), FastEthernet0/0
R3#show ip eigrp interfaces -Which interfaces are running the EIGRP process
IP-EIGRP interfaces for process 10
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Lo3 0 0/0 0 0/1 0 0
Fa0/0 1 0/0 865 0/2 4260 0
R3#show ip protocols - Shows K Values, AS#, and may great details.
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240
Automatic network summarization is in effect
Automatic address summarization:
192.168.2.0/24 for Loopback3
3.0.0.0/8 for FastEthernet0/0
Summarizing with metric 128256
Maximum path: 4
Routing for Networks:
3.3.3.3/32
192.168.2.0
Routing Information Sources:
Gateway Distance Last Update
(this router) 90 00:02:12
192.168.2.1 90 00:02:41
Distance: internal 90 external 170
R3#
IP-EIGRP Traffic Statistics for AS 10
Hellos sent/received: 81/81
Updates sent/received: 5/5
Queries sent/received: 1/0
Replies sent/received: 0/1
Acks sent/received: 5/3
SIA-Queries sent/received: 0/0
SIA-Replies sent/received: 0/0
Hello Process ID: 208
PDM Process ID: 138
IP Socket queue: 0/2000/2/0 (current/max/highest/drops)
Eigrp input queue: 0/2000/2/0 (current/max/highest/drops)
R3#show ip eigrp topology - Shows you routes that made it into the topology table.
IP-EIGRP Topology Table for AS(10)/ID(3.3.3.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 3.3.3.3/32, 1 successors, FD is 128256
via Connected, Loopback3
P 4.4.4.4/32, 1 successors, FD is 307200
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 1.1.1.1/32, 1 successors, FD is 307200
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 3.0.0.0/8, 1 successors, FD is 128256
via Summary (128256/0), Null0
P 192.168.1.0/24, 1 successors, FD is 284160
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 192.168.2.0/24, 1 successors, FD is 281600
via Connected, FastEthernet0/0
P 192.168.3.0/24, 1 successors, FD is 284160
via 192.168.2.1 (307200/281600), FastEthernet0/0
R3#show ip eigrp neighbors - Displays the neighbors discovered by EIGRP.
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.2.1 Fa0/0 13 00:03:30 865 5000 0 8
R3#show ip eigrp topology all - You can see the routes that are not feasible successors
IP-EIGRP Topology Table for AS(10)/ID(3.3.3.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 3.3.3.3/32, 1 successors, FD is 128256, serno 13
via Connected, Loopback3
P 4.4.4.4/32, 1 successors, FD is 307200, serno 10
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 1.1.1.1/32, 1 successors, FD is 307200, serno 9
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 3.0.0.0/8, 1 successors, FD is 128256, serno 14
via Summary (128256/0), Null0
P 192.168.1.0/24, 1 successors, FD is 284160, serno 7
via 192.168.2.1 (307200/281600), FastEthernet0/0
P 192.168.2.0/24, 1 successors, FD is 281600, serno 6
via Connected, FastEthernet0/0
P 192.168.3.0/24, 1 successors, FD is 284160, serno 8
via 192.168.2.1 (307200/281600), FastEthernet0/0
R3#show ip eigrp interfaces -Which interfaces are running the EIGRP process
IP-EIGRP interfaces for process 10
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Lo3 0 0/0 0 0/1 0 0
Fa0/0 1 0/0 865 0/2 4260 0
R3#show ip protocols - Shows K Values, AS#, and may great details.
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240
Automatic network summarization is in effect
Automatic address summarization:
192.168.2.0/24 for Loopback3
3.0.0.0/8 for FastEthernet0/0
Summarizing with metric 128256
Maximum path: 4
Routing for Networks:
3.3.3.3/32
192.168.2.0
Routing Information Sources:
Gateway Distance Last Update
(this router) 90 00:02:12
192.168.2.1 90 00:02:41
Distance: internal 90 external 170
R3#
Saturday, March 3, 2012
Eigrp Part 5: Topology Table & Fail over scenario.
Show ip EIGRP topology = This shows you the current successor and feasible successor routes in the topology table.
Show ip EIGRP topology all-links = This shows you the current successor and feasible successor routes plus any additional routes that can be used to reach specific prefixes (Subnets).
Examples are below.
If you look at subnet 172.16.2.0/24, you see a successor and feasible successor in the topology table but there is another path in my network to reach this route but it’s not considered a successor or feasible successor, it won’t show up in the topology table. If you use show ip EIGRP topology all-links you can see the additional route which will be used if the successor and feasible successor were to go down.
R2#show ip EIGRP topology
IP-EIGRP Topology Table for AS(10)/ID(192.168.1.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
IP-EIGRP Topology Table for AS(10)/ID(192.168.1.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.10.10.0/30, 1 successors, FD is 28160
via Connected, FastEthernet0/1
P 11.11.11.0/24, 2 successors, FD is 30720
via 10.10.10.1 (30720/28160), FastEthernet0/1
via 12.12.12.2 (30720/28160), FastEthernet1/0
via 192.168.1.1 (1737216/28160), FastEthernet0/0
P 12.12.12.0/24, 1 successors, FD is 28160
via Connected, FastEthernet1/0
P 192.168.1.0/24, 1 successors, FD is 1734656
via Connected, FastEthernet0/0
via 12.12.12.2 (337920/335360), FastEthernet1/0, serno 11
via 10.10.10.1 (335360/332800), FastEthernet0/1
P 172.16.1.0/24, 1 successors, FD is 156160
via 10.10.10.1 (156160/153600), FastEthernet0/1
via 192.168.1.1 (1862656/153600), FastEthernet0/0
P 172.16.2.0/24, 1 successors, FD is 156160
via 10.10.10.1 (156160/128256), FastEthernet0/1
via 192.168.1.1 (1862666/128266), FastEthernet0/0
R2#
via Connected, FastEthernet0/1
P 11.11.11.0/24, 2 successors, FD is 30720
via 10.10.10.1 (30720/28160), FastEthernet0/1
via 12.12.12.2 (30720/28160), FastEthernet1/0
via 192.168.1.1 (1737216/28160), FastEthernet0/0
P 12.12.12.0/24, 1 successors, FD is 28160
via Connected, FastEthernet1/0
P 192.168.1.0/24, 1 successors, FD is 1734656
via Connected, FastEthernet0/0
via 12.12.12.2 (337920/335360), FastEthernet1/0, serno 11
via 10.10.10.1 (335360/332800), FastEthernet0/1
P 172.16.1.0/24, 1 successors, FD is 156160
via 10.10.10.1 (156160/153600), FastEthernet0/1
via 192.168.1.1 (1862656/153600), FastEthernet0/0
P 172.16.2.0/24, 1 successors, FD is 156160
via 10.10.10.1 (156160/128256), FastEthernet0/1
via 192.168.1.1 (1862666/128266), FastEthernet0/0
R2#
R2#show ip EIGRP topology all-links
IP-EIGRP Topology Table for AS(10)/ID(192.168.1.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
IP-EIGRP Topology Table for AS(10)/ID(192.168.1.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.10.10.0/30, 1 successors, FD is 28160, serno 1
via Connected, FastEthernet0/1
via 192.168.1.1 (1734912/256256), FastEthernet0/0, serno 10
P 11.11.11.0/24, 2 successors, FD is 30720, serno 7
via 10.10.10.1 (30720/28160), FastEthernet0/1
via 12.12.12.2 (30720/28160), FastEthernet1/0
via 192.168.1.1 (1737216/28160), FastEthernet0/0
P 12.12.12.0/24, 1 successors, FD is 28160, serno 2
via Connected, FastEthernet1/0
via 10.10.10.1 (33280/30720), FastEthernet0/1
via 192.168.1.1 (1739776/30720), FastEthernet0/0
P 192.168.1.0/24, 1 successors, FD is 1734656, serno 3
via Connected, FastEthernet0/0
via 12.12.12.2 (337920/335360), FastEthernet1/0, serno 11
via 10.10.10.1 (335360/332800), FastEthernet0/1
P 172.16.1.0/24, 1 successors, FD is 156160, serno 8
via 10.10.10.1 (156160/153600), FastEthernet0/1
via 12.12.12.2 (158720/156160), FastEthernet1/0
via 192.168.1.1 (1862656/153600), FastEthernet0/0
P 172.16.2.0/24, 1 successors, FD is 156160, serno 9
via 10.10.10.1 (156160/128256), FastEthernet0/1
via 12.12.12.2 (158720/156160), FastEthernet1/0 via 192.168.1.1 (1862666/128266), FastEthernet0/0
R2#
via Connected, FastEthernet0/1
via 192.168.1.1 (1734912/256256), FastEthernet0/0, serno 10
P 11.11.11.0/24, 2 successors, FD is 30720, serno 7
via 10.10.10.1 (30720/28160), FastEthernet0/1
via 12.12.12.2 (30720/28160), FastEthernet1/0
via 192.168.1.1 (1737216/28160), FastEthernet0/0
P 12.12.12.0/24, 1 successors, FD is 28160, serno 2
via Connected, FastEthernet1/0
via 10.10.10.1 (33280/30720), FastEthernet0/1
via 192.168.1.1 (1739776/30720), FastEthernet0/0
P 192.168.1.0/24, 1 successors, FD is 1734656, serno 3
via Connected, FastEthernet0/0
via 12.12.12.2 (337920/335360), FastEthernet1/0, serno 11
via 10.10.10.1 (335360/332800), FastEthernet0/1
P 172.16.1.0/24, 1 successors, FD is 156160, serno 8
via 10.10.10.1 (156160/153600), FastEthernet0/1
via 12.12.12.2 (158720/156160), FastEthernet1/0
via 192.168.1.1 (1862656/153600), FastEthernet0/0
P 172.16.2.0/24, 1 successors, FD is 156160, serno 9
via 10.10.10.1 (156160/128256), FastEthernet0/1
via 12.12.12.2 (158720/156160), FastEthernet1/0 via 192.168.1.1 (1862666/128266), FastEthernet0/0
R2#
While doing some EIGRP testing, I notice that all your EIGRP neighbors should have the same hold-time and hello interval configured. Imagine this, your successor path has a hello interval of 2 and hold-time of 6, should that path fail your feasible successor path will pickup in 6 seconds, but on your feasible successor path you never changed the default hello (5sec) and hold-time (15sec) interval which is fine for a single failure scenario.
What happens if you have a double failure scenario? You now have to wait 15 seconds for any convergence to happen since you never changed the timer on the feasible successor path. I tested this myself. Best practice is to have a baseline across your network and always test a double failure scenario.
Sunday, February 26, 2012
Thursday, February 23, 2012
EIGRP PART3
EIGRP K VALUES/Metrics:
By default EIGRP only uses
K1= Bandwidth (Default) least bandwidth of all outgoing interfaces on the route to the destination network.
K2= Load
K3= Delay(Default) the sum of the delays configured on the interfaces, on the route to the destination network, in tens of microseconds.
K4= Reliabitly
K5= MTU
Verify K values in use:
R1#show ip protocols
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
192.168.1.1/32
Passive Interface(s):
FastEthernet0/1
VoIP-Null0
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170
R1#
EIGRP NEIGHBORSHIP FORMATION:
You can define static neighbor ships or dynamic ones. Under the router eigrp process you will need to define the static neighbor.
router eigrp 10
neighbor 192.168.1.2 fastEthernet 0/0
Verify static neighbor: Note the difference how shows you the static neighbor and the other does not.
R1#show ip eigrp neighbors detail
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 14 00:00:10 46 276 0 13
Static neighbor
Version 12.4/1.2, Retrans: 0, Retries: 0
R1#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 14 00:00:19 46 276 0 13
R1#
The caveat with this is that you can not form dynamic neighborships once you specify a static neighbor via that interface. EIGRP disables all multicast messaging via that interface. You also still need to specify the network command for that specific interface.
By default EIGRP only uses
K1= Bandwidth (Default) least bandwidth of all outgoing interfaces on the route to the destination network.
K2= Load
K3= Delay(Default) the sum of the delays configured on the interfaces, on the route to the destination network, in tens of microseconds.
K4= Reliabitly
K5= MTU
Verify K values in use:
R1#show ip protocols
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
192.168.1.1/32
Passive Interface(s):
FastEthernet0/1
VoIP-Null0
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170
R1#
EIGRP NEIGHBORSHIP FORMATION:
You can define static neighbor ships or dynamic ones. Under the router eigrp process you will need to define the static neighbor.
router eigrp 10
neighbor 192.168.1.2 fastEthernet 0/0
Verify static neighbor: Note the difference how shows you the static neighbor and the other does not.
R1#show ip eigrp neighbors detail
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 14 00:00:10 46 276 0 13
Static neighbor
Version 12.4/1.2, Retrans: 0, Retries: 0
R1#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 14 00:00:19 46 276 0 13
R1#
The caveat with this is that you can not form dynamic neighborships once you specify a static neighbor via that interface. EIGRP disables all multicast messaging via that interface. You also still need to specify the network command for that specific interface.
Monday, February 20, 2012
EIGRP 1 Part 1
EIGRP; Enhance Interior Gateway Protocol is a Cisco Propriety protocol and can only be used between Cisco devices which is a downfall as it is one of the fastest protocols when it comes to convergence due to the way it works. EIGRP has something called successor route and feasible successor route. It pretty much remembers the alternative path in-case the (Primary) success route is removed from the routing table. Even though the (secondary) path by have a worse metric, it still keeps it in the topology table. EIGRP uses well known multicast address 224.0.0.10(IPV4) and ff02::a(IPV6) to communicate with its neighbors. EIGRP only advertises its full routing table when it first establishes a neighborship. The rest of the updates are triggered updates (when a network change occurs)
Router(config)#int f0/0
Router(config-if)#no shut
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config)#router eigrp 10
Router(config)#no auto-summary (disables auto summary for classes addresses)
Router(config-router)#passive-interface default (Enable passive interface for all interfaces on this device for eigrp process 10)
Router(config-router)#no passive-interface fastEthernet 0/0 (Exclude interface f0/0 from being a passive interface, hellos can be sent now)
Router(config-router)#network 192.168.1.1 0.0.0.0
Router(config-router)#exit
This is how your verify which interfaces are in passive mode.
Router#show ip protocols
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
192.168.1.1/32
Passive Interface(s):
FastEthernet0/0
FastEthernet0/1
VoIP-Null0
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170
Verify Eigrp hello timer. The default is 5 seconds. 3 to 1 ratio on the hold time.
Router#show ip eigrp interfaces detail fastEthernet 0/0
IP-EIGRP interfaces for process 10
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0/0 1 0/0 45 0/2 50 0
Hello interval is 5 sec
Next xmit serial <none>
Un/reliable mcasts: 0/1 Un/reliable ucasts: 1/3
Mcast exceptions: 1 CR packets: 1 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Authentication mode is not set
Use multicast
Router#
Verify EIGRP hold time. The default is 15seconds There is no way if knowing what is configured unless your issue a show run which is not always allowed on the ccnp exams so you need to guesstimate but this should be fairly simple.
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 11 00:02:14 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 13 00:02:18 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 12 00:02:19 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 11 00:02:19 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 10 00:02:20 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 10 00:02:25 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 13 00:02:27 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 12 00:02:28 45 270 0 3
Router#
3 to 1 ratio recommended. This tells your neighbor device that he needs to send you a hello before 6 seconnds and this also tells your router to send a hello every 2 seconds.
Router(config-if)#ip hello-interval eigrp 10 2
Router(config-if)#ip hold-time eigrp 10 6
Router(config)#int f0/0
Router(config-if)#no shut
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config)#router eigrp 10
Router(config)#no auto-summary (disables auto summary for classes addresses)
Router(config-router)#passive-interface default (Enable passive interface for all interfaces on this device for eigrp process 10)
Router(config-router)#no passive-interface fastEthernet 0/0 (Exclude interface f0/0 from being a passive interface, hellos can be sent now)
Router(config-router)#network 192.168.1.1 0.0.0.0
Router(config-router)#exit
This is how your verify which interfaces are in passive mode.
Router#show ip protocols
Routing Protocol is "eigrp 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 10
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
192.168.1.1/32
Passive Interface(s):
FastEthernet0/0
FastEthernet0/1
VoIP-Null0
Routing Information Sources:
Gateway Distance Last Update
Distance: internal 90 external 170
Verify Eigrp hello timer. The default is 5 seconds. 3 to 1 ratio on the hold time.
Router#show ip eigrp interfaces detail fastEthernet 0/0
IP-EIGRP interfaces for process 10
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0/0 1 0/0 45 0/2 50 0
Hello interval is 5 sec
Next xmit serial <none>
Un/reliable mcasts: 0/1 Un/reliable ucasts: 1/3
Mcast exceptions: 1 CR packets: 1 ACKs suppressed: 0
Retransmissions sent: 0 Out-of-sequence rcvd: 0
Authentication mode is not set
Use multicast
Router#
Verify EIGRP hold time. The default is 15seconds There is no way if knowing what is configured unless your issue a show run which is not always allowed on the ccnp exams so you need to guesstimate but this should be fairly simple.
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 11 00:02:14 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 13 00:02:18 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 12 00:02:19 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 11 00:02:19 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 10 00:02:20 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 10 00:02:25 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 13 00:02:27 45 270 0 3
Router#show ip eigrp neighbors
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0/0 12 00:02:28 45 270 0 3
Router#
Updating Hello and Hold Timer. You can not do this on a per neighbor case, all neighbors known through this interface will have to abide by these settings. Think if your using a switch with one core vlan.
3 to 1 ratio recommended. This tells your neighbor device that he needs to send you a hello before 6 seconnds and this also tells your router to send a hello every 2 seconds.
Router(config-if)#ip hello-interval eigrp 10 2
Router(config-if)#ip hold-time eigrp 10 6
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