It means that if your serial link goes down,
the router will want to bring up the ISDN.
The commands are here (frame relay using the bri0 to back up):
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/1600/1600swcf
/frmrelay.htm#xtocid563825
Watch the word wrap and this is one of those links with an anchor so scroll
up to the top of the page for the full nitty gritty.
A serial interface can not "become" a BRI interface.
HTH
> HI all
> what does this configuration mean?
>
> Router(config)#interface S0
> Router(config-if)#backup interface bri0
>
> Does it mean that if S0 as a primary link fails, then
> this So interface will become bri0 interface as an
> backup link?
> or
> it means that another physical interface (here,bri0)
> will be activated while S0 is down?
>
> Which one is a correct interpretation?
>
> Thanks in adv.
>
> jeongwoo
>
>
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