11-30-2009 05:08 AM - edited 03-04-2019 06:49 AM
Hello everybody,
I have a strange situation, please explain me why it happend
From BGP peer I have recieved 4 prefixes:
2 prefixes x.x.x.x/16 and two prefexis with /24.
about the first two prefexis (/16) everything fine.
i can see it via: sh ip bgp a.a.a.a/16; sh ip bgp b.b.b.b/16
sh ip bgp neighbors A.A.A.A routes
*> a.a.a.a/16 x.x.85.30 0 400 0 AS1 AS2 i
*> b.b.b.b/16 x.x.85.30 0 400 0 AS1 AS2 i
*> c.c.0.0 x.x.85.30 0 400 0 AS1 AS2 i
*> d.d.0.0 x.x.85.30 0 400 0 AS1 AS2 i
but i can't see the last two prefixes into the routing table at all:
sh ip bgp c.c.0.0/24; sh ip bgp d.d.0.0/24
% Network not in table
I can see this ranges from another peer, but with /18...
Why this prefixes are not in the routing table, they are even more specific routes...
--
Have a nice day,
Dmitry
11-30-2009 05:24 AM
Please, show us "show run | section bgp" output.
Maybe route-maps or prefix-list filter out this updates?
N.B.
>>but i can't see the last two prefixes into the routing table at all:
You can't see it in bgp table, not in routing table.
Show us output
sh ip route a.a.a.a
sh ip route c.c.c.c
11-30-2009 05:38 AM
Hello,
sh ip route c.c.0.0 255.255.255.0
% Subnet not in table
sh ip route d.d.0.0 255.255.255.0
% Subnet not in table
we don't think about incoming route-map, there only: set local-preference 400.
and i told before i can see all 4 prefixes by the command : sh ip bgp neighbors x.x.x.x routes
it shows the situation after the filter.
i am checking the situation on the local router(local routing table)...
Thank you in advance,
Dmitry
12-02-2009 12:57 AM
Hi,
if I understand correctly both are class C subnets, so /24 is the default subnet mask for them?
Doesn't
sh ip bgp c.c.0.0
and
sh ip bgp d.d.0.0
without any subnet mask work then?
If yes, I guess you are running an IOS version with some default subnet mask bug.
BR,
Milan
12-02-2009 04:03 AM
The partner has stopped to announce this prefixes, so it is hard to make any conclusions...
Thank you for your support!
ps. but it looks very strange ...
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