Redundant routing/switching question

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Jun 6th, 2007
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Hello experts,


The routing table of E3 shows the two routes to the 10.90.153.0/24 network,

via 172.23.31.53 and 172.23.31.24.


When I disconnect the link between THCC_1 and Test_1, the routing table on

E3 updates to show just the one route via

172.23.30.24, but I lose the ability to ping or traceroute from E3 to Test_1.

Test_2 pings and traces fine.


Is this a routing or spanning tree issue?

(or maybe there's a better way to do this redundancy?)


My diagram attached. All devices are 3560's.


Thanks much, Ric



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anandramapathy Wed, 06/06/2007 - 06:59
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Are you running any kind of routing ( EIGRP / OSPF ) here

ricschaaf Wed, 06/06/2007 - 07:04
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Thanks. Yes. E3, THCC_1, THCC_2 are running EIGRP.

anandramapathy Wed, 06/06/2007 - 07:13
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What about Test_1 & Test_2 ? are they too running EIGRP.



anandramapathy Wed, 06/06/2007 - 07:26
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What is the output When you do a

show ip route


on the Test_1 when the Link between THCC_1 & Test_1 is down.


Is there any reason that Test_1 is not runnign EIGRP

anandramapathy Wed, 06/06/2007 - 07:40
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IF you do not want to run EIGRP on Test_1, then you have to put 2 static default Routes on it with different metrics - one pointing to 10.90.153.101 & 10.90.153.2


Then the return packets will flow back to E3 & you will be able to ping to Test_1 from E1


The same will be the case for Test_2


With regard to your design.


what are you connecting on various switches ?


ricschaaf Wed, 06/06/2007 - 07:59
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Thanks.


I've turned on EIGRP on both Test_1 and Test_2.


It re-routes fine when I disconnect either (THCC_1 to Test_1) link or (THCC_2 to Test_2) link.


But now the problem is when I disconnect the link between Test_1 and Test_2, I lose connection to Test_2 because E3 thinks the route to it is still via THCC_1 and Test_1.


Test_1 and Test_2 will have client computers

connected to them. If I have one DHCP scope

for the 10.90.153.0/24 network, what should the router be set to? Test_1 or Test_2?

anandramapathy Wed, 06/06/2007 - 20:39
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What are the subnet masks for the various IPs

anandramapathy Wed, 06/06/2007 - 20:45
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What are the functions of E1,THCC_1 & THCC_2 switches

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