[j-nsp] L2VPN Active Route Selection

[Stacy W. Smith]

Do you have anything configured under [edit protocols bgp path-selection]? Specifically, do you happen to have "cisco-non-deterministic" configured?

--Stacy


On Jun 27, 2011, at 8:35 AM, Eric Van Tol wrote:
> Hi all,
> I've got a question about the route selection for L2VPN routes (Kompella).  I'm trying to figure out why my PEs are not choosing the direct IBGP peering between themselves for active route selection.  Here's the basic topology:
> 
>      /--P1--P3--P5--P7--\
> PE1 --    |   |   |   |   -- PE2
>      \--P2--P4--P6--P8--/
> 
> 
> PE1 is RR client of P1/P2.
> PE2 is RR client of P7/P8.
> 
> P1/P2 are RR clients of P3/P4.
> P7/P8 are RR clients of P5/P6.
> 
> P3/P4/P5/P6 are all full-mesh IBGP peers.
> 
> I'm using IS-IS for my IGP and RSVP as the label distribution protocol.
> 
> The LSP is setup between PE1 and PE2 and IBGP is established.  According to http://tinyurl.com/625ve7w, it appears to me that #9 should be the tie-breaker here.  All other criteria are the same.  However, both PE1 and PE2 are showing the best path as the prefix announced through their respective RRs with "Not Best in its group - No difference".  Below is the output of a 'show route extensive' the VPN's routing table.  Can someone take a look and school me on what it is I'm missing?
> 
> Thanks,
> evt
> 
> ~~~~
> 
> admin at lab.router# run show route table cid-512.l2vpn.0 detail    
> 
> cid-512.l2vpn.0: 3 destinations, 5 routes (3 active, 0 holddown, 0 hidden)
> 10.18.20.10:2:1:1/96 (3 entries, 1 announced)
>        *BGP    Preference: 170/-101
>                Route Distinguisher: 10.18.20.10:2
>                Next hop type: Indirect
>                Next-hop reference count: 11
>                Source: 10.18.20.72
>                Protocol next hop: 10.18.20.10
>                Indirect next hop: 2 no-forward
>                State: <Secondary Active Int Ext>
>                Local AS:  65000 Peer AS:  65000
>                Age: 6d 2:03:37         Metric2: 1 
>                Task: BGP_65000.10.18.20.72+49179
>                Announcement bits (1): 0-cid-512-l2vpn 
>                AS path: I (Originator) Cluster list:  10.18.20.72 10.18.20.70 10.18.20.65 10.18.20.67
>                AS path:  Originator ID: 10.18.20.10
>                Communities: target:65000:2 Layer2-info: encaps:VLAN, control flags:Control-Word, mtu: 0, site preference: 100
>                Import Accepted
>                Label-base: 800000, range: 4, status-vector: 0x0 
>                Localpref: 100
>                Router ID: 10.18.20.72
>                Primary Routing Table bgp.l2vpn.0
>         BGP    Preference: 170/-101
>                Route Distinguisher: 10.18.20.10:2
>                Next hop type: Indirect
>                Next-hop reference count: 11
>                Source: 10.18.20.73
>                Protocol next hop: 10.18.20.10
>                Indirect next hop: 2 no-forward
>                State: <Secondary NotBest Int Ext>
>                Inactive reason: Not Best in its group - No difference
>                Local AS:  65000 Peer AS:  65000
>                Age: 6d 2:03:37         Metric2: 1 
>                Task: BGP_65000.10.18.20.73+52338
>                AS path: I (Originator) Cluster list:  10.18.20.73 10.18.20.70 10.18.20.65 10.18.20.67
>                AS path:  Originator ID: 10.18.20.10
>                Communities: target:65000:2 Layer2-info: encaps:VLAN, control flags:Control-Word, mtu: 0, site preference: 100
>                Import Accepted
>                Label-base: 800000, range: 4, status-vector: 0x0 
>                Localpref: 100
>                Router ID: 10.18.20.73
>                Primary Routing Table bgp.l2vpn.0
>         BGP    Preference: 170/-101
>                Route Distinguisher: 10.18.20.10:2
>                Next hop type: Indirect
>                Next-hop reference count: 11
>                Source: 10.18.20.10
>                Protocol next hop: 10.18.20.10
>                Indirect next hop: 2 no-forward
>                State: <Secondary NotBest Int Ext>
>                Inactive reason: Not Best in its group - No difference
>                Local AS:  65000 Peer AS:  65000
>                Age: 6d 2:03:37         Metric2: 1 
>                Task: BGP_65000.10.18.20.10+59106
>                AS path: I
>                Communities: target:65000:2 Layer2-info: encaps:VLAN, control flags:Control-Word, mtu: 0, site preference: 100
>                Import Accepted
>                Label-base: 800000, range: 4, status-vector: 0x0 
>                Localpref: 100
>                Router ID: 10.18.20.10
>                Primary Routing Table bgp.l2vpn.0
> 
> 
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