From: Salau,Olayemi (Olayemi.Salau@southampton.gov.uk)
Date: Fri Jan 05 2007 - 08:51:03 ART
Hello Frank,
What I noticed is that it wouldn't work like that for Ethernet
interfaces, but serial interfaces can belong to same subnet. Reason I
would say because Ethernet Interfaces were designed to belong to a
single subnet (that's what Ethernet is all about anyway - single
broadcast domain); But Serial interfaces have the capability to belong
to same and different subnets.
Any contrary opinion will be highly regarded
Try your configuration using serial interfaces and let me know how you
get on... Below is what I lab'ed up on my router
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Rack1R1#sh ip int b
Interface IP-Address OK? Method Status
Protocol
FastEthernet0/0 unassigned YES unset administratively
down down
Serial1/0 unassigned YES unset administratively
down down
Serial1/1 unassigned YES unset administratively
down down
Serial1/2 unassigned YES unset administratively
down down
Serial1/3 unassigned YES unset administratively
down down
FastEthernet2/0 unassigned YES unset administratively
down down
Rack1R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Rack1R1(config)#int fa0/0
Rack1R1(config-if)#ip address 192.168.2.1 255.255.255.0
Rack1R1(config-if)#no shut
Rack1R1(config-if)#exit
Rack1R1(config)#int f
*Mar 1 00:07:21.307: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed
state to up
*Mar 1 00:07:22.307: %LINEPROTO-5-UPDOWN: Line protocol on Interface
FastEthernet0/0, changed state to up
Rack1R1(config)#int fa2/0
Rack1R1(config-if)#ip address 192.168.2.2 255.255.255.0
% 192.168.2.0 overlaps with FastEthernet0/0
Rack1R1(config-if)#exit
Rack1R1(config)#int s1/0
Rack1R1(config-if)#ip address 192.168.3.1 255.255.255.0
Rack1R1(config-if)#no shut
Rack1R1(config-if)#exit
Rack1R1(config)#exit
*Mar 1 00:08:06.887: %LINK-3-UPDOWN: Interface Serial1/0, changed state
to up
Rack1R1(config)#int s1/1
Rack1R1(config-if)#
*Mar 1 00:08:09.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface
Serial1/0, changed state to up
Rack1R1(config-if)#ip address 192.168.3.2 255.255.255.0
Rack1R1(config-if)#exit
Rack1R1(config)#exit
Rack1R1#sh ip int b
Interface IP-Address OK? Method Status
Protocol
FastEthernet0/0 192.168.2.1 YES manual up
up
Serial1/0 192.168.3.1 YES manual up
up
Serial1/1 192.168.3.2 YES manual administratively
down down
Serial1/2 unassigned YES unset administratively
down down
Serial1/3 unassigned YES unset administratively
down down
FastEthernet2/0 192.168.2.2 YES manual administratively
down down
Rack1R1#
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Many Thanks
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