why cisco implemented 'ip uncond-bridging'?

[zhichao]

If I am not wrong, prio version 6, CSS can do bridging without any problem. After version 6, you have to use 'ip uncond-bridging' to overrite the default behavior (routing first, then bridging).

This caused quite some problems in our upgrading.

I dont understand why Cisco implemente such a feature, i.e. routing first. What's the purpose?

[Gilles Dufour]

Sorry but this command existed even before version 6.x and it has always been necessary to use it to force bridging first than routing.

This was not a Cisco decision but something imposed to us by the company that created the CSS [Arrowpoint].

Regards,

Gilles.

[zhichao]

thanks

But I did not find it in version 4/5 user guide.

[Gilles Dufour]

probably only documented in version 6.x

but I'm 100% sure it is present in version 5.0

Gilles.

[zhichao]

thanks. How about version 4?

We just upgraded one CSS from version 4 to version 6, after that we faced some problem. Suspecting it could be due to the new feature. Maybe it was not in version 4...

[Gilles Dufour]

the command was introduced in version R4.01 B50s.

Bug CSCdt26207 , changed the behavior in 4.1B20 so that

the CSS tries to route every packet.

It was not configurable.

Then, we created the command 'ip uncond-bridging' in version 4.1B50s so you can chose the behavior that you need.

Gilles.

[zhichao]

I C. thanks!