Useful OSPF redistribution tip

From: Thomas Bridge (thomas@wibble.to)
Date: Tue Feb 24 2004 - 06:13:30 GMT-3


So this morning I decide to enable mobile IP on a LAN at work to help
a customer get around a rather serious traffic issue.

I go on to the router and make the following changes:

interface f 0/0
  ip mobile arp
router ospf 1
  redistribute mobile subnets

And yet for the life of me I cannot see the corresponding route on the
OSPF neighbors.

It turns out that the problem is actually an old

summary-address x.y.z.0 255.255.224.0

which we had enabled on the router for our entire /19 (this is for something
going way back to the days when I didn't understand OSPF as well and this
network was part of something else).

So my tip is:

If you're having problems getting to see redistibuted routes in OSPF make
sure you've not broken things by summarising unneccessarily when redistributing
into OSPF,

Thomas



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