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Webcast-Catalyst9k
New Member

Need some info on 7204VXR

Greetings! I need some help with using ip unnumbered on a 7204VXR and a 1601 using a T1 interface. IP addresses work fine, but no luck with ip unnumbered. I was told it might have something to do with the backplane design. Any suggestions? Thanks!

Alan

4 REPLIES
Gold

Re: Need some info on 7204VXR

IP unnumbered is purely software, not hardware, and the T1 drivers and code should support this just fine. What's the actual problem you are seeing? Can't route across it, or? It's probably a routing protocol or ip problem, if it's anything--not related to teh 7200 at all....

Russ

New Member

Re: Need some info on 7204VXR

Russ,

I just found out that the ethernet interface on the 1601 has been acting up a bit. Maybe that has something to do with it, since the s0 relies on the ip address from the e0 int. As of now, we are using ip addresses on the serial interfaces and everything works fine. We would like to use ip unnumbered if possible, though.

Alan

New Member

Re: Need some info on 7204VXR

It sure is nice to have an IP address on S0 to ping when troubleshooting. Just my two cents worth. You can use the 10.x.x.x/30 if you need address space for the links.

IP Unnumbered: http://www.cisco.com/warp/public/701/20.html

http://www.cisco.com/univercd/cc/td/doc/product/software/ssr83/rpc_r/48383.htm

Caveats per above link:

Only those serial interfaces using HDLC encapsulation may be unnumbered. It is not possible to use this subcommand with X.25 interfaces.

You cannot use the ping command to determine if the interface is up, since the interface has no address. SNMP (Simple Network Management Protocol) may be used to remotely monitor interface status.

You cannot netboot a runnable image over an unnumbered serial interface.

You cannot support IP security options on an unnumbered interface.

The argument interface-name is the name of another interface in the network server which has an IP address, not another unnumbered interface.

The interface defined by the interface-name argument must be enabled (listed as "up" in the show interfaces command display) for dynamic routing to work properly.

Of course, you have your reasons for going for the unnumbered scheme, my personal preference leans me to go the other way.

New Member

Re: Need some info on 7204VXR

Ok, thanks for the links and the tips.

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