BGP keeps advertising unavailable route on ASA

[TsadikuBahiru78025]

we redestributed a route from ospf to bgp then the bgp keeps advertising the route even if the ospf is turned off

[paul driver]

Hello

is the route part of a summary address?

[TsadikuBahiru78025]

Hi Paul,

Thank you!

If I understand it correctly, we didn't summarized anything we just redistributed the route from ospf to bgp as it is

[paul driver]

Hello

so the asa is running bgp 

sh route bgp 
sh route x.x.x.x

sh bgp summary 

[TsadikuBahiru78025]

sh bgp summary

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.10.2.52 4 65534 4412 3977 11 0 0 3d01h 8
10.10.2.54 4 65534 4405 3976 11 0 0 3d01h 8

show route bgp

>

> show route 172.17.39.0

% Subnet not in table

After the issue we have added static route to the ASA from the switch. So, I think that's why it is not showing the roue on "sh route bgp'

[TsadikuBahiru78025]

The scenario is like this:

with one leg the ASA connects with a router and runs ospf and receive routes from the router and then with another leg the ASA connects to a nexus switch and runs bgp. So, the route should go from the router to the switch through redistribution. The subnets are:

172.17.39.0/24

10.200.20.17/32

Normally, we went for such arrangement because the ASA doesn't have a feature of route reflector for ibgp.

[Giuseppe Larosa]

Hello @TsadikuBahiru78025 ,

at this point I would remove BGP from ASA and run OSPF with both the router and the switch.

So no need for redistirbution on ASA and this job is moved on the switch.

Hope to help

Giuseppe

[TsadikuBahiru78025]

Hello Giuseppe,

Thank you!

That may be a solution. Let me try it and notify you.

[TsadikuBahiru78025 · Accepted solution]

Hello Giuseppe,

Thank you so much, we have managed to resolve the issue.

[Giuseppe Larosa]

Hello @TsadikuBahiru78025 ,

thank you for feedback

can you provide more detals on the solution ?

Have you moved the OSPF to BGP redistirbution to the switch or you have found a way to do it correctly on ASA ?

Just to have a complete history.

Best Regards

Giuseppe

[TsadikuBahiru78025]

Hello Giuseppe,

As you suggested, I just replaced the bgp between the asa and the switch with ospf. Previously, we have also tried this way but the neighborship was not happening. As we debug it, it was an mtu issue between the switch and the asa. So, once we matched the mtu the neighborship happened and now they exchange route perfectly.

Thank You.