The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: Penultimate Hop Popping
On Fri, Aug 29, 2003 at 10:24:22PM +0530, Bhavesh Modi wrote: > > Hi all > > As RFC 3031 says ( Section 3.16 ), If we do not use Penultimate Hop > Popping , the egress router will have to do two table lookups even in > case of only single label in label stack - one for determinig that it > has to pop the label & second traditional IP lookup. But instead of > only telling to pop the label can't we have one more field which gives > it next hop? If we have such thing, there is no need of penultimate hop > popping in case of stack of sigle label atleast. Has any vendor > implemented such technique? What you're talking about is replacing explicit-null with a real label value. This is an implementation-specific thing at the tail; simply advertise a non-null, real label for a given prefix or next-hop or whatever. One of the problems with this approach is dealing with the payload of whatever's underneath this bottom label without looking at the payload. eric > > -Bhavesh Modi > MTech-ICT > DA-IICT. > Gandhinagar > > ------- > The MPLS-OPS Mailing List > Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml > Archive: http://www.mplsrc.com/mpls-ops_archive.shtml ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml
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