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LDP vs RSVP - Cisco Learning Network LDP is designed to be highly extensible, using TLV triplets to be able to transport multiple additional fields in the future and warrantee the compatibility with previous versions via ignoring the unknown new fields LDP is highly flexible, as supports local and remote neighbors (using targeted LDP sessions)
Cisco Learning Network Routers select their LDP ID very similar to how they do it for OSPF Highest loopback address first, then highest physical address You need to bounce your LDP process to change the LDP ID of the router
Making sense of MP-BGP, LDP and IGP in an MPLS SP domain - LDP is required to automatically signal the LSP's based on the best next-hops calculated by the underlying IGP by advertising labels (based on next hops) to directly connected LDP neighbors throughout the MPLS domain of the Service Provider LDP advertises labels for every prefix in the routing table It is not based on next-hop
Cant get mpls ldp neighbors to come up. GNS3 problem? Check and make sure the LDP identifier is reachable by both routers, R1 and R3 You can use the show mpls ldp discovery command to check the LDP identifier Try to ping the LDP identifier on R3 from R1 to confirm connectivity
Why MPLS LDP Neighborship does not form between routers in a same vlan If the LDP neighbor doesn't now how to route to the other peer then the LDP peering will not be formed For example, R2 and R3 are layer 2 adjacent but will not form a peering relationship: R2-PE1#show mpls ldp discovery detail
Difference between LDP discovery holdtime and peer holdtime? %LDP-5-NBRCHG: LDP Neighbor 10 20 20 1:0 (1) is DOWN (Discovery Hello Hold Timer expired) As far as I understood the discovery hold timer still works to determine the state but if so when does the session hold timer come into play?
Did Cisco implement LDP FEC aggregate feature (draft-swallow-mpls . . . Juniper does have this by using the set protocols ldp longest-match command This will allow ABR L1-L2 routers to aggregate prefixes at the area boundary, as LDP continues to distribute the labels for 32's, this capability will allow then to leverage the longest match prefix in inet 0 and installation of the particular 32 FEC in inet 3 would
Cisco Learning Network Since, by all accounts, IGP exchanging routes and LDP exchanging labels are two separate processes Hence the advent of LDP-IGP sync to mitigate the use of routes we don't have labels for From what I gather, the author is then contrasting that with using BGP with label distribution Stating that if BGP went down, you'd lose the label and prefix
Cisco Learning Network Normally, LDP advertises labels only for IP prefixes that are in the routing table You can use the mpls ldp advertise-labels interface command to force LDP to advertise a label for a prefix constructed from an interface address and a 32-bit mask Such a prefix is not usually in the routing table Examples