[c-nsp] VRF & Hairpin Routing?

[Lasher, Donn]

The router tends to get a little peeved seeing itself twice.

While you can trick it in some cases, the only way I've found, in a
reliable fashion, to do what you're trying to accomplish, is with
another L3 device, IE router in between. R1 <-> R2 <-> R1

I've taken a 2811, dual-ethernet'd into a 7200, then dot'1'q and ospf
into a VRF to come back in and out. That works solidly.

However, the thing you have to consider, any way you do it, is route
redistribution, leakage, and overall design. Things can start to get
ugly when all the same networks exist in more than 1 VRF and  you route
between them.



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Joe Maimon
Sent: Thursday, April 06, 2006 2:00 PM
To: Sean Watkins
Cc: 'cisco-nsp at puck.nether.net'
Subject: Re: [c-nsp] VRF & Hairpin Routing?



Sean Watkins wrote:

> Hi,
> Vlans 10 & 11 are connected together in an upstream switch  via a 
> crossover cable.
> 

Why dont you just dedicate a vlan for each inter-vrf  connection like
so:

int fa0/0.10
encap do 10
ip addr 10.10.10.1 255.255.255.0
int fa0/1.10
encap do 10
ip vrf fo X
ip addr 10.10.10.2 255.255.255.0

Dont need anything "fancy" in the switch.

You can actually build this with tunnels and loopbacks. You can also use
a crossover cable between two fastethernets on the router without a
switch.

Joe
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