The MPLS WG Archive

["Thomas D. Nadeau" <tnadeau@cisco.com>]

On Dec 7, 2005, at 10:15 AM, Ken Nagami wrote:

> Hi Tom,
>
> Thnak you for your reply.
>
> I agree that your method can get a 2nd label during a local repair  
> in use.
> However, before using a local repair, I do not understand why your
> method can get a 2nd label.
> A Cross-Connect in the MPLS-LSR-STD-MIB for the 2nd label
> is only created during the local repair in use.
> So, before using a local repair, I think I can not get the 2nd label.
> Is this correct?

	That is correct. However, since the backup/protection
tunnel is signaled at the time you configure protection,
the LSP (i.e.: label) should be active. The LFIB should
just not be moving any traffic onto that tunnel at the PLR.

	--Tom


>
> Regards,
>
> Ken Nagami
>
>
> At 23:17 05/12/07, Thomas D. Nadeau wrote:
>
>> On Nov 29, 2005, at 9:06 PM, Ken Nagami wrote:
>>
>>> Dear authors and all,
>>>
>>> I have a following comment for the FRR MIB (draft-ietf-mpls-  
>>> fastreroute-mib-04).
>>> Could you reflect this comment in the document?
>>>
>>> Comment:
>>> I would like to get a 2nd label of a bypass tunnel at a PLR in the
>>> facility backup.
>>> I think a pointer of 1st (top) label of the bypass tunnel at a PLR
>>> can be get from the FRR MIB.
>>> But the 2nd label can not be get.
>>>
>>> Because I would like to check a 2nd label of a bypass tunnel and an
>>> incoming label at the MP.
>>> In the case of the node protection, two label values are normally
>>> the same.
>>> But if a router has a bug, the value might be different.
>>> So, we would like to check those values before local repair from a
>>> network management box.
>>
>>         The MPLS-FRR-MIB provides a reference back to the TE tunnel
>> in the MPLS-TE-STD-MIB which can be used to find the LSP that
>> is in use for that tunnel head. From the tunnelEntry in the MPLS- 
>> TE- STD-MIB
>> you can get the Cross-Connect (XCindex) of the LSP that is in use for
>> that
>> tunnel head from the MPLS-LSR-STD-MIB, which will have a  
>> corresponding
>> mplsLabelStackTable entry that should have the extra label
>> shown under the top label shown in the mplsInSegmentTable.

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