[nsp] 127.0.0.0/8 unroutable?

[Ong Beng Hui]

> IOS 12.0(25)S2:
>
> ip route 10.0.0.0 255.0.0.0 FastEthernet1/0/0
> ip route 127.0.0.0 255.0.0.0 FastEthernet1/0/0
>
> TAU-gp1#sho ip rou 127.0.0.0
> % Network not in table
> TAU-gp1#sho ip rou 10.0.0.0
> Routing entry for 10.0.0.0/8
>    Known via "static", distance 1, metric 0 (connected)
>    Redistributing via ospf 378
>    Routing Descriptor Blocks:
>    * directly connected, via FastEthernet1/0/0
>        Route metric is 0, traffic share count is 1
>
> Something magical that 127.0.0.0/8 can't be statically routed?

I believe certain platforms, ie, possibly C10k, cat6500
uses 127.0.0.0 block to talk between modules.