[j-nsp] BGP multipath trouble.

[Harry Reynolds]

Try configuring external-router-id:

http://www.juniper.net/techpubs/software/junos/junos76/swconfig76-routin
g/html/bgp-summary42.html

HTHs

 

> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of 
> Vladimir S. Blazhkun
> Sent: Tuesday, August 15, 2006 12:18 PM
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] BGP multipath trouble.
> 
> 
> Hello, i have a trouble with load-balancing traffic to the 
> same prefix, with the same AS_PATH, and other metrics. I have 
> 2 upstream connections to different ASes, see all required 
> outputs below. Both next-hops are not installed for 
> forwarding traffic (seems first one is preferred due 
> implementation of draft-ietf-idr-avoid-transition). Are there 
> any workarounds for this in JUNOS 6.4?
> 
> # show protocols bgp group UPstream-peers
> 
> type external;
> graceful-restart {
>      disable;
> }
> multipath;
> neighbor XXX.XXX.0.125 {
>      passive;
>      import [ remove-private-as remove-bogus-nets 
> long-prefixes flap-damping UPstream-XXXXX-Import ];
>      export UPstream-XXXXX-Announce;
>      peer-as XX16;
> }
> neighbor XXX.XXX.99.45 {
>      passive;
>      import [ remove-private-as remove-bogus-nets 
> long-prefixes flap-damping UPstream-XXXXXXXXXXX-Import ];
>      export UPstream-XXXXXXXXXXX-Announce;
>      peer-as XX99;
> }
> 
> # run show route forwarding-table destination 4/8
> 
> Routing table: inet
> Internet:
> Destination        Type RtRef Next hop           Type Index 
> NhRef Netif
> 4.0.0.0/8          user     0                    indr   603 13757
>                                XXX.XXX.0.125      ucst   589  
>    3 fe-0/3/1.104
> 
> # run show route 4/8 exact detail
> 
> 4.0.0.0/8 (2 entries, 1 announced)
>          *BGP    Preference: 170/-101
>                  Next-hop reference count: 219519
>                  Source: XXX.XXX.0.125
>                  Next hop: XXX.XXX.0.125 via fe-0/3/1.104, selected
>                  Protocol next hop: XXX.XXX.0.125 Indirect 
> next hop: 863a700 603
>                  State: <Active Ext>
>                  Local AS: XXXXX Peer AS:  XX16
>                  Age: 2:48:29    Metric: 200     Metric2: 0
>                  Task: BGP_XX16.XXX.XXX.0.125+26165
>                  Announcement bits (3): 0-KRT 
> 4-BGP.0.0.0.0+179 5-Resolve inet.0
>                  AS path: XX16 3356 I (Atomic) Aggregator: 
> 3356 4.69.130.2
>                  Communities: 3356:0 3356:3 3356:100 3356:123 
> 3356:575 3356:2011
>                  Localpref: 100
>                  Router ID: XXX.XX.0.216
>           BGP    Preference: 170/-101
>                  Next-hop reference count: 542310
>                  Source: XXX.XXX.99.45
>                  Next hop: XXX.XXX.99.45 via fe-0/3/1.105, selected
>                  Protocol next hop: XXX.XXX.99.45 Indirect 
> next hop: 863a400 587
>                  State: <Ext>
>               !! ->> Inactive reason: Active preferred
>                  Local AS: XXXXX Peer AS:  XX99
>                  Age: 2:47:18    Metric: 200     Metric2: 0
>                  Task: BGP_XX99.XXX.XXX.99.45+17205
>                  AS path: XX99 3356 I (Atomic) Aggregator: 
> 3356 4.69.130.10
>                  Communities:
>                  Localpref: 100
>                  Router ID: XX.XXX.146.98
> 
> --
> Vladimir S. Blazhkun,
> JNSS-M JNCIA-M #773 JNCIS-M #1100 JNCIP-M #289 JNCI-M JNCIA-J 
> JNCI-J _______________________________________________
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