The MPLS-OPS Archive

[Puddinhead Wilson <puddinghead_wilson007@yahoo.co.uk>]

> Again , LDP as well as BGP based VPLS can have RSVP
> tunnels - it is
> irrelevant.What is important here
> is fact that in LDP based solution works through
> setting up targeted
> sessions and exchanging FEC elements
> carrying information about VC labels.This procedure
> is inherently
> point-to-point which could help ( as some
> ppls argue ) to have better ( fine grained) control
> over PW ( since specific
> attributes to one PW can be exchanged in p2p
> fashion).
> In contrast , in BGP based solution PE "broadcasts"
> blocks of usable label
> for CE link ( label offset , base and range ) from
> which other
> PE's  chose appropriate label. As you can see , in
> BGP solution there is no
> room for signalling PW specific attributes -
> information
> is shared by all "interested" PE's.
> 

i agree. The inherent loop avoidance mechanism in BGP
is worth it.
> 
> >>
> >> 4. Data-plane failure: there can be scenarios
> where
> >> an operator may want to reset a PW (bring down
> and
> >> up). In such cases, a new label is desired to be
> >> assigned (in case there is an issue with the
> label
> >> itself). This is inherently done with LDP
> protocol;
> >> whereas with BGP protocol and label-block scheme
> the
> >> same label gets assigned over and over again.
> >
> >I dont know about the "label block" schemes, I
> never
> >did really understand it. could someone clarify it?
> 
> It refers to BGP based solution - all is explained
> in draft :)
> 

yes i did read it,even in the older version, thanks to
Per for clarifying it again,

Lets get back to some basic questions then
a. are labels unique per router or per interface
b. is a stack of [label1][label2] same as
[label2][label1] ?
In other words does the order/precending label not
matter when looking for a pointer to the table?
c. stack=> [label1][label2], if label 1 = vlan id = 1
and label 2 = ce/site/whateverdemuxid=2, and another
set of label 1= vlanid = 2 and label 2 =1, are these 2
the not different from a demuxing view point?
So making them equal to vlan /and or site ids is not a
problem, is it?
the question still boils down to "1 label" end host to
end host, is it not?

> 
> best regards ,
> 
> Piotr Marecki
> Netia S.A
> 
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