[j-nsp] Routing Engine Redundancy

[Gary Tate]

When an RE is in backup state RPD is not running so it cannot route 
admin. traffic.  The backup routers statement gives the default gateway 
for the backup-re

It is normally the next hop router on the subnet fxp0 is connected to.

Also the IP addresses cannot be the same as fxp0 is active on both REs 
and so you will see dup ip address errors.

Hope this helps
Gary

snort bsd wrote:

> Hi:
> 
> I have questions for routing engine redundancy:
> 
> root at troy# commit synchronize
> re0:
> configuration check succeeds
> re1:
> [edit interfaces fxp0 unit 0 family inet]
>   'address 192.168.100.196/27'
>     warning: [edit system backup-router] not present.
> The default route for fxp0 is not installed.
> commit complete
> re0:
> commit complete
> 
> The scenario is like this: two routing engins with two
> fxp0. Both has the same IP address and the same
> host-name. Here is the configuration:
> 
> version 7.0R2.7;
> groups {
>     re0 {
>         system {
>             host-name telmex-m10i-n0;
>         }
>         interfaces {
>             fxp0 {
>                 unit 0 {
>                     family inet {
>                         address 200.38.156.196/28;
>                     }
>                 }
>             }
>         }
>     }
>     re1 {
>         system {
>             host-name telmex-m10i-n0;
>         }
>         interfaces {
>             fxp0 {
>                 unit 0 {
>                     family inet {
>                         address 200.38.156.196/28;
>                     }
>                 }
>             }
>         }
>     }
> }
> 
> ...
> 
> chassis {
>     redundancy {
>         routing-engine 0 master;
>         routing-engine 1 backup;
>         failover on-loss-of-keepalives;
>         graceful-switchover {
>             enable;
>         }
>     }
>     alarm {
>         management-ethernet {
>             link-down yellow;
>         }
>     }
> }
> ...
> 
> I am confused about the "backup-router" statement.
> Could anyone here explain it?
> 
> Thanks
> 
> dave_au
> 
> 
> 		
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