[j-nsp] BGP multipath trouble.

[Vladimir S. Blazhkun]

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