Nokia Lab | LAB 5 RSVP-TE basic |
Hi!
RSVP-TE is a complex and wide range topic. I'm starting with RSVP-TE basic configuration and control plane processes - label signaling, session maintaining, timers, interaction between RSVP-TE and IGP. The next labs cover CSPF, Resource reservation, Resiliency.
Please check my first lab for input information.
Topology example
Lab tasks and questions:
- basic RSVP-TE configuration
- what we need for RSVP-TE infrastructure?
- configure IGP with TE extension (e.g. OSPF)
- add all p2p and "system" interfaces to MPLS and RSVP context
- Do routers establish RSVP-TE adjacency? Why?
- protocol operation
- create LSP from R1 to R6 with an "empty" path
- examine LSP signaling process(use debug or Wireshark)
- capture PATH and RESV messages and examine their content
- describe label signaling process
- examine PSB and RSB (see "useful debug commands" section)
- How do routers refresh RSVP sessions? What messages do they use?
- How do routers maintain RSVP adjacency? What message do they use?
- examine LSP tearing down process
- break some link with active RSVP session and capture PathTear and ResvTear messages
- describe tearing down process and message purpose
- RSVP-TE timers
- break some link with active RSVP session (e.g. LSP to_R6)
- examine LSP on Head-end and check LSP operation status
- What is LSP operation status?
- When does Head-end start signal LSP again?
- describe the purpose of the retry timer
- resignal timer
- What is the purpose of the resignal timer?
- What is the default value of the resignal timer?
- Try to change the default timer and examine Head-end behavior. (Resignal timer has more value in the case with CSPF setup. I will return to this point in the next labs)
- create LSP from R6 to R1 with "explicit" path - R6 - R5 - R3 - R4 - R2 - R1
- examine label signaling process in this case
- What is the purpose of the ERO?
- What is the difference between ERO and RRO?
- RSVP-TE and IGP interaction (no CSPF case)
- Let's look at LSP from R1 to R6 with loose path
- e.g. it may have path R1 - R2 - R4 - R6
- try to increase IGP metric (e.g. link metric toward R4 on R2 )
- examine LSP status on Head-end
- What is LSP operation status?
- describe interaction between RSVP-TE and IGP
Github project
Useful debug commands
show router ospf opaque-database detail
show router rsvp session detail
show router mpls lsp detail
show router mpls path detail
tools dump router te-database detail
tools dump router mpls te-lspinfo detail
tools dump router rsvp psb detail
tools dump router rsvp rsb detail
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