10-21-2008 03:26 AM - edited 03-04-2019 12:00 AM
Hi,
We need to make a couple of changes to our configuration and would appreciate any feedback on possible pitfalls.
The configuration is as follows:
2 x Cisco 1603 Routers on ethernet LANs linked via leased line.
Router 1 -
configured for Bridge IRB
Ethernet + Serial + BVI all in bridge-group 1
Ethernet - no IP address
BVI - 192.168.0.y
Admin only via console port or ISDN BRI0 incoming.
Router 2 -
Ethernet + Serial in bridge-group 1
Ethernet - 192.168.0.x
Admin via ethernet IP address
We need to achieve the following:
1. Change the IP addresses - that's OK but how is the BVI IP address actually used and what are the implications of changing it ?
2. Get admin via the local ethernet for router 1 if possible - will assigning an IP address interfere with the bridge operation.
Many thanks
10-21-2008 08:35 AM
Hello Philip,
for R1 you should be able to access it via telnet using the BVI ip address
verify that:
there are the commands
bridge 1 bridge ip
bridge 1 route ip
and a default route pointing to 192.168.0.x
only doubt :
192.168.0.x should be associated to BV1 on R2 too otherwise how could the two ip addresses have a direct communication ?
I think this is your issue
eth1 on R2 should be in a different subnet and all should be fine
Hope to help
Giuseppe
10-22-2008 04:18 AM
Hi Guiseppe,
Thank you for the response.
R1 doesn't respond to telnet on the BVI IP.
It's missing the Bridge 1 bridge ip command.
Also I can't see any reference to a default route on either router.
In addition, we would like both ends to be on the same subnet ?
If we configure both routers with the same BVI IP, how could I telnet onto one via that IP ?
I'm wondering if this is just completely mi-configured but lucky it's working.
Would you consider glancing at the IOS commands if I post them ? I understand if you don't have time.
Thanks again
10-22-2008 07:28 AM
Hello Philip,
the two routers must share a common IP subnet.
R1:Bvi1 and R2:bvi1 need to be in the same subnet but to be different
example
R1:Bvi1 192.168.0.1/24
R2:Bvi2 192.168.0.2/24
if you want you can make also R2:eth1 part of same bridge-group 1 to support a flat network (using a single IP subnet)
to be able to telnet you need also to set a password under line vty
line vty 0 4
login
password thisisapass
when you can ping R1:BVI1 from R2 you should be fine.
the default route is needed to reach other subnets if there is only a subnet you don't need it.
If needed R1 can point to R2:Bvi1 and R2 to some other router to reach other IP subnets
Hope to help
Giuseppe
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