[c-nsp] shut interfaces become enabled for some secs while reloading

[simon at pitwood.org]

Just disable the portfast,  it wont have enough time to establish any
connections then


> Has anyone met the above problem?
>
> I'm trying a 7200/G2 with 12.2(31)SB13 and i noticed that while reloading
> it, the shuted interfaces come up for 2 secs,
> which is more than enough time to send packets through them (having
> portfast enabled on the switch port).
>
> I guess the config is parsed sequentially, so if the "shutdown" command
> follows the "ip address x.x.x.x" command (which
> they do when doing "sh run"), ip connectivity is established first.
>
> The problem with the above is that if you have to prepare a second router
> having identical config with another one
> (keeping the interfaces of the second router in the shutdown state), you
> end up having duplicate ips for a while (in my
> case 2 secs) when reloading the second router. This small time is more
> than enough to make the hell out of arp/mac tables!!!
>
> I know there are many ways to avoid all this mess (remove/change ips, shut
> switch ports instead of router ports, etc),
> but i was mainly wondering if all this is expected/normal behavior.
>
> --
> Tassos
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