From: MADMAN (dmadlan@qwest.com)
Date: Mon Feb 09 2004 - 13:48:39 GMT-3
Hmm, strange. I thought I would try to create a duplicate interface
as you did not expecting it to work but it did!!
7500 running 12.2.18s
interface Serial4/1/1.17 point-to-point
ip address 71.1.1.1 255.255.255.0
no arp frame-relay
frame-relay de-group 1 44
frame-relay interface-dlci 17
!
interface Serial4/1/1.18 point-to-point
ip address 71.1.1.1 255.255.255.0
!
So I tried the same thing on an ATM interface in the same router:
interface ATM1/1/0.232 point-to-point
ip address 3.3.3.1 255.255.255.252
pvc 1/232
encapsulation aal5snap
!
C7507A#conf t
Enter configuration commands, one per line. End with CNTL/Z.
C7507A(config)#inter a1/1/0.233
% Incomplete command.
C7507A(config)#inter a1/1/0.233 poi
C7507A(config-subif)#ip add 3.3.3.1 255.255.255.252
3.3.3.0 overlaps with ATM1/1/0.232
C7507A(config-subif)#
Looks like a bug in the frame relay parser!
Dave
Fowlie, Colin wrote:
> Hi all,
>
>
>
> I am helping create some practice scenarios for internal employees, and this following issue was brought to my attention: A router allows duplicate IP addresses to be assigned to Frame-Relay subinterfaces. For example:
>
>
>
> Interface IP-Address OK? Method Status Protocol
>
> FastEthernet0/0 10.130.6.35 YES NVRAM up up
>
> Serial0/0 unassigned YES NVRAM up up
>
> Serial0/0.50 10.130.5.41 YES manual up up
>
> Serial0/0.408 10.130.5.37 YES manual up up
>
> Serial0/0.500 10.130.5.37 YES manual up up
>
>
>
> interface Serial0/0.408 point-to-point
>
> ip address 10.130.5.37 255.255.255.252
>
> ip nat inside
>
> no cdp enable
>
> frame-relay interface-dlci 408
>
> end
>
>
>
> interface Serial0/0.500 point-to-point
>
> ip address 10.130.5.37 255.255.255.252
>
> ip nat inside
>
> no cdp enable
>
> frame-relay interface-dlci 500
>
> end
>
>
>
> Trying to apply IP address assigned to any other type of interface on the box does not work, only the IP address of other Frame subinterfaces. I haven't been able to track down a bug on this issue, wondering if anyone has seen this before and if it is default behavior. Show ip route 10.130.5.37 shows equal-cost connected routes for each configured interface.
>
>
>
> Thanks in advance
>
>
>
> Colin Fowlie
>
> #12757
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"Emotion should reflect reason not guide it"
This archive was generated by hypermail 2.1.4 : Fri Mar 05 2004 - 07:13:48 GMT-3