Hello,
@jackeygor wrote:
For example, RSVP MPLS
We may need ISIS or OSPF, iBGP, RSVP and MPLS configured under protocol.
I don't understand how the IGP work with MPLS.
Speaking about "RSVP MPLS" in particular, one needs link-state IGP (not RIP, and not static routes) for loop prevention. Before sending out RSVP Path message, ingress LSR needs to build a loop-free ERO (Explicit Route Object).
RSVP does not have own loop prevention capability, it uses that of link-state IGP.
Otherwise, if there is a loop in the network, the RSVP LSP will never establish.
HTH
Thanks
Alex