08-27-2012 08:04 PM - edited 03-07-2019 08:33 AM
Hi Everyone,
Forgive me if I am totally off on this configuration, but I am looking into EIGRP for use in the distribution and access layers (eventually to the core) with redundant links for high-availability. I am working on setting up a test environment to get a better understanding of how things will work. I know it’s in the early stages and there’s lots of tuning that can be put in place with regards to route summarization etc. This is just to get things setup, and build on that.
Here’s how things are currently setup:
All links between switchs are /30
It seems to be partly working, from the access-2 switch I can ping the vlans on access-1 without issue, there located in the route table all is good. However on access-1 I don’t have any routes to the vlans on access-2.
Also in the distribution switches (dist-1 & dist-2) I only have the routes for the vlans that are attached the access switches as per the show ip route.
Also note:
I can ping from dist-1 to any of the vlans on access-1
I cannot ping from dist-1 to any of the vlans on access-2
I cannot ping from dist-2 to any of the vlans on access-2
I can ping from dist-2 to any of the vlans on access-1
All switches are 3550’s running c3550-ipservicesk9-mz.122-50.SE.bin
Configs (Access-1)
Access-1# sh ip route
Gateway of last resort is not set
172.16.0.0/30 is subnetted, 5 subnets
D 172.16.0.16 [90/30720] via 172.16.0.9, 01:17:19, FastEthernet0/23
[90/30720] via 172.16.0.1, 01:17:19, FastEthernet0/24
D 172.16.0.12 [90/30720] via 172.16.0.9, 01:17:19, FastEthernet0/23
C 172.16.0.8 is directly connected, FastEthernet0/23
D 172.16.0.4 [90/30720] via 172.16.0.1, 01:17:19, FastEthernet0/24
C 172.16.0.0 is directly connected, FastEthernet0/24
10.0.0.0/24 is subnetted, 3 subnets
C 10.0.10.0 is directly connected, Vlan10
C 10.0.30.0 is directly connected, Vlan30
C 10.0.20.0 is directly connected, Vlan20
Access-1# sh ip eigrp neighbours
EIGRP-IPv4:(1) neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 172.16.0.9 Fa0/23 14 01:30:14 1 200 0 77
0 172.16.0.1 Fa0/24 11 01:30:15 1 200 0 70
access-1#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.0.10)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.0.30.0/24, 1 successors, FD is 2816
via Connected, Vlan30
P 172.16.0.8/30, 1 successors, FD is 28160
via Connected, FastEthernet0/23
P 10.0.20.0/24, 1 successors, FD is 2816
via Connected, Vlan20
P 10.0.10.0/24, 1 successors, FD is 2816
via Connected, Vlan10
P 172.16.0.16/30, 2 successors, FD is 30720
via 172.16.0.1 (30720/28160), FastEthernet0/24
via 172.16.0.9 (30720/28160), FastEthernet0/23
P 172.16.0.0/30, 1 successors, FD is 28160
via Connected, FastEthernet0/24
P 172.16.0.12/30, 1 successors, FD is 30720
via 172.16.0.9 (30720/28160), FastEthernet0/23
P 172.16.0.4/30, 1 successors, FD is 30720
via 172.16.0.1 (30720/28160), FastEthernet0/24
EIGRP Configuration on Access -1
router eigrp 1
no auto-summary
eigrp stub connected summary
network 10.0.10.1 0.0.0.0
network 10.0.20.1 0.0.0.0
network 10.0.30.1 0.0.0.0
network 172.16.0.2 0.0.0.0
network 172.16.0.10 0.0.0.0
Configs (Access-2)
access-2#sh ip route
Gateway of last resort is not set
172.16.0.0/30 is subnetted, 5 subnets
D 172.16.0.16 [90/30720] via 172.16.0.13, 01:18:50, FastEthernet0/23
[90/30720] via 172.16.0.5, 01:18:50, FastEthernet0/24
C 172.16.0.12 is directly connected, FastEthernet0/23
D 172.16.0.8 [90/30720] via 172.16.0.13, 01:18:50, FastEthernet0/23
C 172.16.0.4 is directly connected, FastEthernet0/24
D 172.16.0.0 [90/30720] via 172.16.0.5, 01:18:50, FastEthernet0/24
10.0.0.0/24 is subnetted, 6 subnets
D 10.0.10.0 [90/30976] via 172.16.0.13, 01:18:51, FastEthernet0/23
[90/30976] via 172.16.0.5, 01:18:51, FastEthernet0/24
D 10.0.30.0 [90/30976] via 172.16.0.13, 01:18:51, FastEthernet0/23
[90/30976] via 172.16.0.5, 01:18:51, FastEthernet0/24
D 10.0.20.0 [90/30976] via 172.16.0.13, 01:18:51, FastEthernet0/23
[90/30976] via 172.16.0.5, 01:18:51, FastEthernet0/24
C 10.0.40.0 is directly connected, Vlan40
C 10.0.60.0 is directly connected, Vlan60
C 10.0.50.0 is directly connected, Vlan50
access-2#sh ip eigrp neighbors
EIGRP-IPv4:(1) neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 172.16.0.13 Fa0/23 10 01:33:35 1 200 0 78
0 172.16.0.5 Fa0/24 13 01:33:35 1 200 0 69
access-2#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.0.14)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.0.30.0/24, 2 successors, FD is 30976
via 172.16.0.5 (30976/28416), FastEthernet0/24
via 172.16.0.13 (30976/28416), FastEthernet0/23
P 172.16.0.8/30, 1 successors, FD is 30720
via 172.16.0.13 (30720/28160), FastEthernet0/23
P 10.0.20.0/24, 2 successors, FD is 30976
via 172.16.0.5 (30976/28416), FastEthernet0/24
via 172.16.0.13 (30976/28416), FastEthernet0/23
P 10.0.10.0/24, 2 successors, FD is 30976
via 172.16.0.5 (30976/28416), FastEthernet0/24
via 172.16.0.13 (30976/28416), FastEthernet0/23
P 172.16.0.16/30, 2 successors, FD is 30720
via 172.16.0.5 (30720/28160), FastEthernet0/24
via 172.16.0.13 (30720/28160), FastEthernet0/23
P 172.16.0.0/30, 1 successors, FD is 30720
via 172.16.0.5 (30720/28160), FastEthernet0/24
P 172.16.0.12/30, 1 successors, FD is 28160
via Connected, FastEthernet0/23
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 172.16.0.4/30, 1 successors, FD is 28160
via Connected, FastEthernet0/24
EIGRP Configuration
router eigrp 1
no auto-summary
eigrp stub connected summary
network 10.0.40.0 0.0.0.0
network 10.0.50.0 0.0.0.0
network 10.0.60.0 0.0.0.0
network 172.16.0.6 0.0.0.0
network 172.16.0.14 0.0.0.0
Configs (dist-1)
DIST-1#sh ip route
Gateway of last resort is not set
172.16.0.0/30 is subnetted, 5 subnets
C 172.16.0.16 is directly connected, FastEthernet0/24
D 172.16.0.12 [90/30720] via 172.16.0.18, 01:35:04, FastEthernet0/24
[90/30720] via 172.16.0.6, 01:35:04, FastEthernet0/2
D 172.16.0.8 [90/30720] via 172.16.0.18, 01:35:48, FastEthernet0/24
[90/30720] via 172.16.0.2, 01:35:48, FastEthernet0/1
C 172.16.0.4 is directly connected, FastEthernet0/2
C 172.16.0.0 is directly connected, FastEthernet0/1
10.0.0.0/24 is subnetted, 3 subnets
D 10.0.10.0 [90/28416] via 172.16.0.2, 01:35:47, FastEthernet0/1
D 10.0.30.0 [90/28416] via 172.16.0.2, 01:35:47, FastEthernet0/1
D 10.0.20.0 [90/28416] via 172.16.0.2, 01:35:47, FastEthernet0/1
C 192.168.2.0/24 is directly connected, FastEthernet0/21
DIST-1#sh ip eigrp neighbors
EIGRP-IPv4:(1) neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 172.16.0.6 Fa0/2 12 01:35:55 1 200 0 50
0 172.16.0.2 Fa0/1 10 01:36:39 1 200 0 40
2 172.16.0.18 Fa0/24 12 01:56:47 1 200 0 76
DIST-1#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(192.168.2.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.0.30.0/24, 1 successors, FD is 28416
via 172.16.0.2 (28416/2816), FastEthernet0/1
P 172.16.0.8/30, 2 successors, FD is 30720
via 172.16.0.2 (30720/28160), FastEthernet0/1
via 172.16.0.18 (30720/28160), FastEthernet0/24
P 10.0.20.0/24, 1 successors, FD is 28416
via 172.16.0.2 (28416/2816), FastEthernet0/1
P 10.0.10.0/24, 1 successors, FD is 28416
via 172.16.0.2 (28416/2816), FastEthernet0/1
P 172.16.0.16/30, 1 successors, FD is 28160
via Connected, FastEthernet0/24
P 172.16.0.0/30, 1 successors, FD is 28160
via Connected, FastEthernet0/1
P 172.16.0.12/30, 2 successors, FD is 30720
via 172.16.0.6 (30720/28160), FastEthernet0/2
via 172.16.0.18 (30720/28160), FastEthernet0/24
P 172.16.0.4/30, 1 successors, FD is 28160
via Connected, FastEthernet0/2
router eigrp 1
no auto-summary
network 172.16.0.1 0.0.0.0
network 172.16.0.5 0.0.0.0
network 172.16.0.17 0.0.0.0
Configs (dist-2)
DIST-2#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/30 is subnetted, 5 subnets
C 172.16.0.16 is directly connected, FastEthernet0/24
C 172.16.0.12 is directly connected, FastEthernet0/2
C 172.16.0.8 is directly connected, FastEthernet0/1
D 172.16.0.4 [90/30720] via 172.16.0.17, 01:37:34, FastEthernet0/24
[90/30720] via 172.16.0.14, 01:37:34, FastEthernet0/2
D 172.16.0.0 [90/30720] via 172.16.0.17, 01:38:17, FastEthernet0/24
[90/30720] via 172.16.0.10, 01:38:17, FastEthernet0/1
10.0.0.0/24 is subnetted, 3 subnets
D 10.0.10.0 [90/28416] via 172.16.0.10, 01:38:18, FastEthernet0/1
D 10.0.30.0 [90/28416] via 172.16.0.10, 01:38:18, FastEthernet0/1
D 10.0.20.0 [90/28416] via 172.16.0.10, 01:38:18, FastEthernet0/1
DIST-2#sh ip eigrp neighbors
EIGRP-IPv4:(1) neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 172.16.0.14 Fa0/2 12 01:38:36 1 200 0 51
1 172.16.0.10 Fa0/1 14 01:39:20 1 200 0 41
2 172.16.0.17 Fa0/24 10 01:59:29 1 200 0 66
DIST-2#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(192.168.1.14)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.0.30.0/24, 1 successors, FD is 28416
via 172.16.0.10 (28416/2816), FastEthernet0/1
P 172.16.0.8/30, 1 successors, FD is 28160
via Connected, FastEthernet0/1
P 10.0.20.0/24, 1 successors, FD is 28416
via 172.16.0.10 (28416/2816), FastEthernet0/1
P 10.0.10.0/24, 1 successors, FD is 28416
via 172.16.0.10 (28416/2816), FastEthernet0/1
P 172.16.0.16/30, 1 successors, FD is 28160
via Connected, FastEthernet0/24
P 172.16.0.0/30, 2 successors, FD is 30720
via 172.16.0.10 (30720/28160), FastEthernet0/1
via 172.16.0.17 (30720/28160), FastEthernet0/24
P 172.16.0.12/30, 1 successors, FD is 28160
via Connected, FastEthernet0/2
P 172.16.0.4/30, 2 successors, FD is 30720
via 172.16.0.14 (30720/28160), FastEthernet0/2
via 172.16.0.17 (30720/28160), FastEthernet0/24
router eigrp 1
no auto-summary
network 172.16.0.9 0.0.0.0
network 172.16.0.13 0.0.0.0
network 172.16.0.18 0.0.0.0
Any thoughts or ideas are greatly appreachated, if there is anything else you need output wise let me know.
Thanks
Mike
Solved! Go to Solution.
08-28-2012 04:09 AM
Hi Mike,
you should advertise only the loopbac with a 0.0.0.0 wildcard... The network statement should match the /30 with a 0.0.0.3 wildcard and the VLAN with their relative wildcard... for example
router eigrp 1
no auto
network 10.0.40.0 0.0.0.255
that is not enough of course. Since the VLAN serving your final hosts must not speak eigrp, you should apply the passive-interface command to the relative vlans:
router eigrp 1
no auto
network 10.0.40.0 0.0.0.255
passive interface vlan 40 ! assuming 10.0.40.0/24 is the vlan 40
i would remove the stub statement too
hope this helps
Alessio
08-28-2012 04:09 AM
Hi Mike,
you should advertise only the loopbac with a 0.0.0.0 wildcard... The network statement should match the /30 with a 0.0.0.3 wildcard and the VLAN with their relative wildcard... for example
router eigrp 1
no auto
network 10.0.40.0 0.0.0.255
that is not enough of course. Since the VLAN serving your final hosts must not speak eigrp, you should apply the passive-interface command to the relative vlans:
router eigrp 1
no auto
network 10.0.40.0 0.0.0.255
passive interface vlan 40 ! assuming 10.0.40.0/24 is the vlan 40
i would remove the stub statement too
hope this helps
Alessio
08-29-2012 06:46 PM
Awesome!
Thanks for your help Alessio! I made the changes and everything works as expected. I did some reading and watched some more configuration videos as well. Lots to learn yet, I am sure I'll be back with some more questions in the future.
Mike
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