Hi Santosh, A sham link is essentially a tunnel, similar to a virtual link, except that it has this special function of maintaining LSA types across the cloud. It is required between any two sites that share a backdoor link. If no backdoor link exists between the sites, then a sham-link is not required.
Cheers, Manav > -----Original Message----- > From: Santosh P K [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 20, 2007 4:58 PM > To: Padma Pillay-Esnault > Cc: [email protected] > Subject: Re: [OSPF] doubt on sham link > > 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 _______________________________________________ OSPF mailing list [email protected] https://www1.ietf.org/mailman/listinfo/ospf
