From: Erick B. (erickbe@yahoo.com)
Date: Sat Mar 15 2003 - 00:11:51 GMT-3
IOS lets you use the same IP subnet on up to 4 serial
interfaces. I believe this was used back in the old
days maybe for backup or load balancing to same
router.
--- "Lupi, Guy" <Guy.Lupi@eurekanetworks.net> wrote:
> Are both interfaces up? Usually as long as one of
> the interfaces is down,
> the router will let you assign a duplicate IP
> address.
>
> -----Original Message-----
> From: love cisco [mailto:love_cisco@hotmail.com]
> Sent: Thursday, March 13, 2003 6:47 PM
> To: ccielab@groupstudy.com
> Subject: Duplicate IP address in the same router
>
>
> Has anybody see the duplicate ip address in the same
> router. The router
> working OK and no error message in the router. The
> IOS version is 12.2. Any
> idea?
>
>
> test-R2#sh run
> Building configuration...
>
> Current configuration : 7559 bytes
> !
> version 12.2
> service timestamps debug datetime localtime
> service timestamps log datetime localtime
> service password-encryption
> !
> hostname test-R2
> !
> logging buffered 4096 debugging
> enable secret 5 $1$W/.T$FQwQv6JwN/3CRqyy9hrgr/
> !
> no ip domain-lookup
> !
> !
> interface FastEthernet0/0
> ip address 10.34.120.170 255.255.255.0
> !
> interface Serial0/0
> bandwidth 1920
> no ip address
> encapsulation frame-relay IETF
> frame-relay traffic-shaping
> !
> interface Serial0/0.385 point-to-point
> bandwidth 1900
> ip address 138.235.243.54 255.255.255.252
> frame-relay interface-dlci 385
> !
> interface Serial0/0.386 point-to-point
> bandwidth 1920
> ip address 138.235.243.58 255.255.255.252
> frame-relay interface-dlci 386
> !
> interface FastEthernet0/1
> ip address 10.34.121.170 255.255.255.0
> !
> interface Serial0/1
> bandwidth 1920
> no ip address
> encapsulation frame-relay
> frame-relay traffic-shaping
> !
> interface Serial0/1.642 point-to-point
> bandwidth 1024
> ip address 138.235.243.26 255.255.255.252
> frame-relay interface-dlci 642
> !
> interface Serial0/1.833 point-to-point
> bandwidth 64
> ip address 172.20.0.34 255.255.255.252
> frame-relay interface-dlci 833
> !
> interface Serial0/2
> bandwidth 1920
> no ip address
> encapsulation frame-relay
> frame-relay traffic-shaping
> !
> interface Serial0/2.385 point-to-point
> bandwidth 1900
> ip address 138.235.243.54 255.255.255.252
> frame-relay interface-dlci 385 IETF
> !
> interface Serial0/2.386 point-to-point
> bandwidth 1920
> ip address 138.235.243.58 255.255.255.252
> frame-relay interface-dlci 386 IETF
> !
> router eigrp 80
> network 10.0.0.0
> network 138.235.0.0
> no auto-summary
> no eigrp log-neighbor-changes
> !
> ip classless
> no ip http server
> !
> line con 0
> line aux 0
> line vty 0 4
> login
>
> end
>
> test-R2#sh ver
> Cisco Internetwork Operating System Software
> IOS (tm) C2600 Software (C2600-DS-M), Version
> 12.2(5), RELEASE SOFTWARE
> (fc1)
> Copyright (c) 1986-2001 by cisco Systems, Inc.
> Compiled Wed 12-Sep-01 02:25 by pwade
> Image text-base: 0x80008088, data-base: 0x8117C66C
>
> ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE
> SOFTWARE (fc1)
>
> test-R2 uptime is 24 weeks, 6 days, 3 hours, 28
> minutes
> System returned to ROM by power-on
> System restarted at 07:24:35 st Sat Sep 21 2002
> System image file is "flash:c2600-ds-mz.122-5.bin"
>
> cisco 2621 (MPC860) processor (revision 0x200) with
> 60416K/5120K bytes of
> memory
> .
> Processor board ID JAD05190SYV (276455499)
> M860 processor: part number 0, mask 49
> Bridging software.
> X.25 software, Version 3.0.0.
> 2 FastEthernet/IEEE 802.3 interface(s)
> 1 Serial network interface(s)
> 2 Serial(sync/async) network interface(s)
> 32K bytes of non-volatile configuration memory.
> 16384K bytes of processor board System flash
> (Read/Write)
>
> Configuration register is 0x2102
>
> test-R2#
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