The MPLS WG Archive

["Vincent Hamrick" <hamrick@coronanetworks.com>]

What if you replace the top label and then push another label?  Against
which label would you store the outSegment counts?  Or would you store them
against both labels?

Thanks,
-V


-----Original Message-----
From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of Vipul
Sharma
Sent: Thursday, June 21, 2001 8:03 PM
To: naderv@msn.com
Cc: mpls@UU.NET
Subject: RE: LSR-MIB Question


Shahram,
	I had run into similar question a while ago...Attached is the info. which
will help you for 1.
My feeling is that since there is no error conditions maybe they need to be
collected in mplsInSegmentDiscards. But that is just what I beleive maybe
the gurus have a differing opinion.
For 2, I believe that we are reqd. to keep 2 sets of stats one for the
swapped label and one for the pushed label
	Thanx,
Vip
vsharma@ieee.org

Attached message
=================================================================


>         In the MPLS MIBs (MPLS TE , MPLS LSR MIBs)I see stats for errored
> packets.
>For e.g. in the MPLS LSR MIB there is mplsInSegmentErrors which is "The
>number of errored packets received on this segment."
>         My question is what type of errors make these packets errored
packets
>because most errored packets are dropped at the physical interface iteself
>by the chips (my understanding). So does this stats put a req. to run the
>phy. interface device in promiscous mode?

         Basically any case where a labeled packet is received and
cannot be forwarded by the MPLS software. There are many cases:
out of bandwidth in the switching fabric, illegal labels in the
packet, etc...


         --Tom




>Vip
>

-----Original Message-----
From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of S. Davari
Sent: Monday, June 11, 2001 6:42 PM
To: mpls@UU.NET
Subject: LSR-MIB Question


Hi All,

A few questions regarding LSR-MIB:

1) If TTL expires in an MPLS packet is the packet
counted in
mplsInSegmentErrors" or not?

2) If we receive a labeled packet and swap the label
and then push a new label
do we keep 2 sets of statistics on the outgoing
segment, one for the swapped
label and one for the pushed label or only one?

BTW, I also noticed that in LSR-MIB a swap consists of
a pop on incoming segment followed
by a push on outgoing segment, this is odd !! The
odder thing is that the incoming segment has
a parameter called InSegmentNpop in which "N"
identifies the number of pops to be performed on the
insegment. How does one know in advance how many pops
to perform? If you know that, then it means
that all those labels that you pop are not used at
all.

Thanks,
-Shahram

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