EIGRP on Lanlink interfaces

Dec 14, 2006 3 Replies

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andre.wisniewski 19 years ago

Hello all

I am runnning two Cisco 2801 with IOS 12.3(8)T6. Both Routers are connected (fa0/0) to network 10.10.10.0 and 170.11.1.0 (fa0/1). HSRP and EIGRP are configured this way

Router A

interface FastEthernet0/0 ip address 10.10.10.3 255.255.255.0 speed 100 full-duplex standby 150 ip 10.10.10.5 standby 150 timers 1 3 standby 150 priority 110 standby 150 preempt standby 150 track FastEthernet0/1

interface FastEthernet0/1 ip address 170.11.1.253 255.255.255.0 standby 152 ip 170.11.1.1 standby 152 timers 1 3 standby 152 priority 110 standby 152 preempt standby 152 track FastEthernet0/0

router eigrp 150 redistribute static network 10.0.0.0 network 170.11.0.0 no auto-summary

ip route 0.0.0.0 0.0.0.0 10.10.10.1 ip route 172.19.70.0 255.255.255.0 170.11.1.4 ip route 172.25.11.0 255.255.255.0 170.11.1.4

Router B

interface FastEthernet0/0 ip address 10.10.10.4 255.255.255.0 speed 100 full-duplex standby 150 ip 10.10.10.5 standby 150 timers 1 3 standby 150 priority 105 standby 150 preempt standby 150 track FastEthernet0/1

interface FastEthernet0/1 ip address 170.11.1.254 255.255.255.0 standby 152 ip 170.11.1.1 standby 152 timers 1 3 standby 152 priority 105 standby 152 preempt standby 152 track FastEthernet0/0

router eigrp 150 redistribute static network 10.0.0.0 network 170.11.0.0 no auto-summary

ip route 0.0.0.0 0.0.0.0 10.10.10.1 ip route 172.19.70.0 255.255.255.0 170.11.1.4 ip route 172.25.11.0 255.255.255.0 170.11.1.4

Interfaces fa0/1 are connected to a switch via Lanlink on remote side, fa0/0 is connected to a switch on local side. If Lanlink on Router A fails interface fa0/1 stays up because connection to modem is still ok but remote network is not reachable any more via this interface. HSRP doesn't switch of course. I can't see any eigrp route "sh ip route eigrp". What can i do to fix this issue?

Thanks in advance.

Andre Wisniewski

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stephen 19 years ago

i am not sure i understand your topology - are the 2801 on the same or different sites?

use "object tracking" to let HSRP switch based on access to an address or routing table contents.

formatting link

maybe the 2 routers should be exchanging routes over the HSRP interface, so they should have a routed path between them - that will also "fix" some transitional forwarding black holes when the network topology changes.

personally i would use OSPF instead - at least you can predict what it will do :)

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Andre 19 years ago

messagenews: snipped-for-privacy@79g2000cws.googlegroups.com...

are the 2801 on the same or

They are on the same site.

contents.http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_featu...>

OK. I will have a look at it

It's worth thinking about it. Thanks so far.

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Andre 19 years ago

messagenews: snipped-for-privacy@79g2000cws.googlegroups.com...

are the 2801 on the same or

contents.http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_featu... Very helpful answer. Thanks a lot. Here is my solution.

I added ...

track 100 rtr 1 reachability delay down 3 up 3

interface FastEthernet0/0 standby 150 track 100 decrement 50

ip sla 1 icmp-echo 170.11.1.23 request-data-size 512 timeout 1000 threshold 2 frequency 3

ip sla schedule 1 life forever start-time now

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