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mandrei99
Post  Post subject: Junos: BGP label allocation failure: Need a nexthop address on LAN  |  Posted: Thu Nov 06, 2014 11:52 am

Joined: Tue Aug 04, 2009 9:16 am
Posts: 245

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Junos: BGP label allocation failure: Need a nexthop address on LAN

Code:
[edit]
admin@R3# run show route advertising-protocol bgp 10.255.0.4 extensive

VRF-1-osiris.inet.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
* 10.43.3.0/24 (1 entry, 1 announced)
BGP group internal type Internal
     Route Distinguisher: 10.255.0.3:1
     BGP label allocation failure: Need a nexthop address on LAN
     Nexthop: Not advertised
     Flags: Nexthop Change
     Localpref: 100
     AS path: [1234567890] I
     Communities: target:1:1


This error is caused by the fact that local VPN routes sitting on a broadcast (Ethernet) segment, advertised to remote PEs, have to have a local/LAN next hop. For VRFs this is done with tunnel PICs or "vrf-table-label".
Code:
[edit]
admin@R3# set routing-instances VRF-1-osiris vrf-table-label

[edit]
admin@R3# commit
commit complete

[edit]
admin@R3# run show route advertising-protocol bgp 10.255.0.4 extensive

VRF-1-osiris.inet.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
* 10.43.3.0/24 (1 entry, 1 announced)
BGP group internal type Internal
     Route Distinguisher: 10.255.0.3:1
     VPN Label: 16
     Nexthop: Self
     Flags: Nexthop Change
     Localpref: 100
     AS path: [1234567890] I
     Communities: target:1:1





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mandrei99
Post  Post subject: Re: Junos: BGP label allocation failure: Need a nexthop address on LAN  |  Posted: Mon Nov 10, 2014 4:28 am

Joined: Tue Aug 04, 2009 9:16 am
Posts: 245

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And a workaround described as a Juniper KB is to configure a contributing /32 route on the LAN: http://kb.juniper.net/InfoCenter/index?page=content&id=KB12430


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