[c-nsp] %BGP-3-INVALID_MPLS: Invalid MPLS label (1)

[Saku Ytti]

On (2008-04-18 20:31 +0200), Christian Bering wrote:

Hey,

> %BGP-3-INVALID_MPLS: Invalid MPLS label (1)
> 
> Seen once in a while simultaneously across all PE routers (SUP720) on software versions SRA, SRB and SRC.
> 
> With the VPNV4 route reflectors running older 12.2S code, would this error point to a problem (bug?) in the route reflectors or the PEs?

I don't think you have anything to worry about. Most likely this is caused by dual-homed site or
import map that may be denying local routes to BGP. Don't you have any prefix behind that 
log message? You could look in that box for the VRF and check it's import maps and also
look 'sh ip bgp vrf X <prefix>' should it say 'no table' it's the culprit when funny
label gets assigned.

CSCsg55591.
--- (apologies for ugly paste)
Symptoms: When there are link flaps in the network, various PE routers receive the following error message:
%BGP-3-INVALID_MPLS: Invalid MPLS label (1) received in update for prefix155:14344:10.150.3.22/32 from
10.2.2.1 Or, a local label is not programmed into the forwarding table for a sourced BGP VPNv4 network.
Conditions: These symptoms are observed when an iBGP path for a VPNv4 BGP network is present, and then a sourced 
path for the same route distinguisher (RD) and prefix is brought up.
Workaround: Remove the iBGP path. Note that when the sourced path comes up first, the symptoms do not occur.
Alternate Workaround: Use different RDs with the different PE routers. When the RD and prefix do not match 
exactly between the iBGP path and the sourced path, the symptoms do not occur.
----

This is new check implemented in CSCeh77395 and can be triggered by several issues (at least 4 documented,
at least CSCsb87499, CSCse99753 are possible).
CSCsg55591 should be fixed in:
12.4(16.12)M 12.0(32)S6c 12.0(32)S7 12.0(32)SY4 12.0(32.3)S3 12.2(32.8.11)SX85 12.2(33)SXH 12.2(46.2)S 12.4(11)T4 12.4(13.13)PI7a 12.4(13.13)T 12.4(13d)M 12.4(16a)M 12.2(32.8.90)SR 12.2(33.1.15)SRB 12.4(9)T6 12.2(18.11.1)SXF 12.2(33)SRB2 12.4(6)T9 12.2(33)SRA6 12.2(18)SXF12 12.2(31)SB10 12.2(28)SB11 12.2(44)SE1

Thanks,

-- 
  ++ytti