[nsp] Duplicate Interface Addresses !!

[David Sinn]

With MPLS/VPN's and VRF's you can have overlapping address space for
each VPN/VRF space.  They probably deprecated the overlap check because
of this.

David

-----Original Message-----
From: kevin gannon [mailto:kevin at lancomms.ie] 
Sent: Monday, February 17, 2003 2:19 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] Duplicate Interface Addresses !!


I spent the last three hours troubleshooting an EIGRP duplicate router 
ID issue.
The route cause was two interface on the same router with the same
address.
Both interfaces were up/up and before the work started only one was up
and
the duplicate address was then added to an already up/up address. To
find
the duplicate address you need some hidden IOS command in EIGRP
otherwise
I would still be looking !!!.

Anyone know why IOS only sometimes warns about this issue ?? You know
the warning you usually get:

kevin(config)#int loop 100
kevin(config-if)#ip address 10.10.10.1 255.255.255.0
10.10.10.0 overlaps with Ethernet0
kevin(config-if)#

I know its not isolated to one IOS revision as I have managed to
trick other IOS versions into creating this duplicate situation.

I have also spent hours troubleshooting MPLS problems due to
the same issue. Its madness !.

Regards,
Kevin

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