[j-nsp] bgp multipath confusion

[Truman Boyes]

The route reflectors are sending the "best" routes. Are there  
different IGP costs between the 4 links? The routes will need to be  
equal to have them all installed as equal. There is an option for VPN  
routes to ignore the IGP metrics, but I assume these are standard inet. 
0 routes.

Truman


On 15/07/2009, at 8:22 PM, Cord MacLeod wrote:

> I guess I don't fully understand how this is supposed to work.  I  
> have an ex4200 device with 4 links, 2 to each m7.  Both m7s are  
> acting as route reflectors and advertising default to the ex4200.   
> The loopbacks are advertised with ISIS.  However when I check BGP's  
> summery and my routing table, it seems multipath isn't working.  Any  
> thoughts?
>
> ex4200:
> root at crs1.sc1# show
> type internal;
> local-address 10.0.0.31;
> export next-hop-self;
> multipath;
> neighbor 10.0.0.13 {
>    description "iBGP to edge1";
>    peer-as 64554;
> }
> neighbor 10.0.0.14 {
>    description "iBGP to edge2";
>    peer-as 64554;
>
> Table          Tot Paths  Act Paths Suppressed    History Damp  
> State    Pending
> inet.0                 2          1          0          0           
> 0          0
> Peer                     AS      InPkt     OutPkt    OutQ   Flaps  
> Last Up/Dwn State|#Active/Received/Accepted/Damped...
> 10.0.0.13          64554         30         28       0       3        
> 12:03 0/1/1/0              0/0/0/0
> 10.0.0.14          64554         58         57       0       3        
> 12:03 1/1/1/0              0/0/0/0
>
>
> 0.0.0.0/0          *[BGP/170] 00:12:36, MED 0, localpref 100, from  
> 10.0.0.14
>                      AS path: 3561 I
>                    > to 10.0.0.69 via ge-0/0/1.0
>                      to 10.0.0.49 via ge-1/0/0.0
>                    [BGP/170] 00:12:36, MED 0, localpref 100, from  
> 10.0.0.13
>                      AS path: 3561 I
>                    > to 10.0.0.69 via ge-0/0/1.0
>                      to 10.0.0.49 via ge-1/0/0.0
>
> .49 and .69 are both /30 link addresses on 10.0.0.13.  So the 2  
> links in place on .14 aren't showing up.
>
> Interface             System         L State        Hold (secs) SNPA
> ge-0/0/0.0            edge2.xxx      2  Up                   23   
> 0:1f:12:d2:d0:db
> ge-0/0/1.0            edge1.xxx      2  Up                   24   
> 0:1f:12:d3:60:2
> ge-1/0/0.0            edge1.xxx      2  Up                   25   
> 0:1f:12:d3:60:db
> ge-1/0/1.0            edge2.xxx      2  Up                   19   
> 0:1f:12:d2:d0:2
>
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