Santosh, Let me jump in here since I think I know where the confusion lies.
- As far as the P routers are concerned, all they see is an
MPLS Label Switched Path (LSP) between the PE routers.
- Section 4.2.7.3 in RFC 4577 does a pretty good job of
explaining OSPF operation in this context. Please re-read
this section and feel free to ask questions.
Hope this helps,
Acee
On Mar 20, 2007, at 7:28 AM, Santosh P K wrote:
Hi Padma, When you said its a "logical construct like VL and it is always a p2p" you mean the underlaying link is always P2P link? If it is an P2P link then PE's should be connected directly not by inbetween P routers right ?I am getting confused with this P2P link. Can you please explain this?On 3/20/07, Padma Pillay-Esnault <[EMAIL PROTECTED]> wrote:Abhay D.S wrote: > Yes forwarded by routers. >> Well, about the demand circuit part I suggest you dont follow the RFC, > since it may or may not be treated as DEMAND circuit.(It is a requirement > of the network to treat it as demand circuit, for example if you have> heavy load> of traffic on sham link then you can treat it as DC(demand circuit).>> If you really want to use sham link optimally, you can just increase> the hello timeout> on the sham links to be large and then let it be a proper p2p link. It> is similar to hello > suppression.. > > --Abhay > > Santosh P K wrote: >> Hi Abhay, >> >> Thanks. Are OSPF control packts just forwarded by P routers on>> sham link ? RFC 4577 says that Sham link is treated as OSPF demand >> circuit. In case of broad cast or NBMA configured as demand circuit >> hello are not supressed as per RFC 1793 section 3.2. that means hello >> are also forwarded to the endpoint just as OSPF control packets by P>> router on sham link? Sham link is a logical construct like VL and it is always a p2p. Thanks Padma >> >> Thanks and regards >> Santosh P K >> >> >> On 3/20/07, Abhay D.S <[EMAIL PROTECTED]> wrote: >>> It is a SHAM...:-). >>>>>> Only sham link end point needs to be enabled in OSPF and reachable over>>> the multi hop >>> network by BGP or static means. >>>>>> Means Sham Link end points must be routable over the network for it to>>> become UP. >>> >>> Santosh P K wrote: >>> > Hi All,>>> > I have some doubts on sham link. If a sham link is configured >>> > between two PE's which are connected by many P routers in IP backbone>>> > , then is it nessary for all the P routes to run OSPF.>>> > As per cisco user guid it is mentioned that>>> > sham link is treated as virtual link. In case of virtual link >>> > inbetween routers need to know OSPF protocol. >>> > >>> > >>> > Thanks and regards >>> > Santosh P K >>> > >>> > _______________________________________________ >>> > OSPF mailing list >>> > [email protected] >>> > https://www1.ietf.org/mailman/listinfo/ospf >>> > >>> > >>> >>> >> >> _______________________________________________ >> OSPF mailing list >> [email protected] >> https://www1.ietf.org/mailman/listinfo/ospf >> >>> --------------------------------------------------------------------- ---> > _______________________________________________ > OSPF mailing list > [email protected] > https://www1.ietf.org/mailman/listinfo/ospf >_______________________________________________ OSPF mailing list [email protected] https://www1.ietf.org/mailman/listinfo/ospf
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