Router alert label : Use case

Hi All

Is there a practical use case that you guys are running for Router Alert
Label ( label =1) in your network ?

1) All the theories indicate that these pkts are punted to s/w for special
investigation . But not sure what investigation and what are those special
cases . Can someone please give an example .

2) For LSP ping option ; LSP pings are also unidirectional .. i.e LSP ping
from A to B will check the labelled path from A to B only ( and not from B
to A ) . Hence i dont understand the usage of option :

ping mpls ipv4 44.44.44.44 255.255.255.255 reply mode router-alert

Hence as per me ; for LSP ping from A to B ; if it goes A-C-D-E-B , and I
am getting a reply as success ; this does not mean that
     a) return traffic would have taken the B-E-D-C-A path
     b) It also do not for sure mean that labelled path from B to A is
intact .

Can some one please clarify these for me .

Regards
Gaurav Madan

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Received on Fri Dec 26 2014 - 15:09:42 ART