Issue with Floating Static Route
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01-28-2025 07:30 AM
Hello,
I’m encountering an issue with floating static routes in a circular topology involving four routers and two PCs
The issue arises when I try to ping PC0 from PC1 after shutting down the primary path. While the primary path works, when the primary interface is disabled, the secondary route doesn't seem to take over correctly. I also sent the packet tracer just in case if anyone could help me.
Thanks in advance for your help!
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Routing Protocols
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01-28-2025 07:34 AM - edited 01-28-2025 07:35 AM
I can not open lab but issue come from
1- you need to use egress interface in static route otherwise if egress is down the route will not remove from rib
2- you need to be sure that there is interconnect between intermittent router otherwise the retrun traffic will drop'
I.e. you need to make sure the return traffic is healthy reachable
MHM
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01-28-2025 07:42 AM
Forward route switched to backup path using floating static route in JTMK router. However, your return route from JRKV is pointing towards JPH instead of UICT. As the return traffic goes to JPH, it drops there as the interface towards JTMK is shut.
You have to shut int f0/1 in JRKV and observe, the traffic will fail over to your secondary path.
Solution:
1. Use track object and ping 40.1 via 50.2 and switch static route when track goes down
2. Use dynamic routing protocol
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01-28-2025 07:47 AM
Seems ip sla and track is not available in Packet Tracer and hence could not test with your topology here.
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01-28-2025 08:40 AM
You can only test this in PT if you disable both interfaces on JPH. Otherwise, the router on the right JRKV will continue to send traffic to the same router which JPH.
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01-28-2025 10:04 PM
Hello
As stated by @Flavio Miranda PT isnt feature rich so ipsla tracking may/not be available for you to test conditional static routing.
Also looking at your topology you have statics throughout it on all rtrs so you would need to apply some condition on all of the rtrs which would be a administrative burden
I understand its not what your OP is asking but as already suggested using an dynamic routing process in this instance would be more applicable such as eigrp and then appending path preference negating the less preferred links
see attached..
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
