Bazzar routes on Sup720

cajalat · ‎11-29-2007

I have these strange routes on a Native Sup720 Distribution that I can't figure out where they're coming from. They're all mostly /32's and they appear to be coming from L3 configured port-channels. Here's a couple of snapshots:

LOF14DISTRT1#sh ip route | inc 169.254

169.254.0.0/16 is variably subnetted, 740 subnets, 2 masks

C 169.254.45.122/32 [0/1] via 169.254.45.122

C 169.254.234.188/32 [0/1] via 169.254.234.188

C 169.254.185.239/32 [0/1] via 169.254.185.239

C 169.254.58.108/32 [0/1] via 169.254.58.108

C 169.254.56.110/32 [0/1] via 169.254.56.110

C 169.254.189.232/32 [0/1] via 169.254.189.232

C 169.254.91.14/32 [0/1] via 169.254.91.14

C 169.254.51.102/32 [0/1] via 169.254.51.102

C 169.254.27.78/32 [0/1] via 169.254.27.78

C 169.254.238.186/32 [0/1] via 169.254.238.186

C 169.254.125.41/32 [0/1] via 169.254.125.41

C 169.254.140.223/32 [0/1] via 169.254.140.223

C 169.254.118.37/32 [0/1] via 169.254.118.37

C 169.254.117.38/32 [0/1] via 169.254.117.38

There are a lot more of those and the cef table looks like this:

LOF14DISTRT1#sh ip cef unresolved

Prefix Next Hop Interface

169.254.1.43/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.2.120/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.2.126/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.3.11/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.3.163/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.3.188/32 10.0.0.82 (?) Port-channel10

169.254.3.213/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.3.254/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.4.141/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.4.178/32 10.0.0.82 (?) Port-channel10

169.254.4.197/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.4.199/32 10.0.0.13 (?) Port-channel30(deleted)

169.254.5.13/32 10.0.0.73 (?) Port-channel16

169.254.6.35/32 10.0.0.13 (?) Port-channel30(deleted)

a Sample port where some of these entries are showing up on:

LOF14DISTRT1#sh run in po 10

Building configuration...

Current configuration : 230 bytes

!

interface Port-channel10

description p2p<->HUB09DISTRT1-a0-po10

bandwidth 2000000

ip address 10.0.0.81 255.255.255.252

ip ospf network point-to-point

ip ospf cost 100

appletalk cable-range 10-10 10.98

ipx network 10

end

Any clue is much appreciated.

Casey

wochanda · ‎11-30-2007

Do you have a static route looking something like this:

ip route 0.0.0.0 0.0.0.0 Port-channel10

?

If so, every packet hitting this route will cause us to ARP for the end host, causing us to fill up our routing table with /32 routes, and fill up our ARP table.

To fix, point this route to the actual next-hop IP.

cajalat · ‎12-01-2007

The only static routes I have are two /32 routes:

ip route 10.3.14.247 255.255.255.255 Vlan359

ip route 172.23.1.47 255.255.255.255 Vlan318

The rest of my routing is connected/OSPF derived.

Casey