Hi Amir,
See answers inline.
Khan Amir-G20247 wrote:
Hi
I have query related to Strict LSA Checking in OSPF Graceful Restart.
Consider this scenario:
- Two Routers R1 and R2, connected with a Broadcast network.
- Where R1 is a DR and R2 as DR-other
- Now R2 wants to perform GR and R1 agrees to be its Helper.
- Now after restart R2 will try and form adjacency with R1.
- Lets say that R1 and R2 had reached Exstart state. Now at this time
another router R3 joins the network.
- This router R3 will effect the contents of R1 LSDB.
- Now if Strict LSA Checking is enabled, R1 will quit from Helper mode.
- After quiting R1 will recalculate DR/BDR and will reoriginate router
LSA and network LSA.
Considering above scenario, my doubts are:
- How will R2 come to know that its Helper has quit ?
When it receives its pre-restart LSA from any neighbor in the area, it
will recognize
that it should terminate graceful restart.
- When will R2 exit GR ?
See above.
- As the NBR state had reached to Exstart before R1 exited, will state
be back to Down and
the adjacency formation will start all over again, once R2 exits GR ?
No - there is no need to. R1 is the DR and should remain DR.
Thanks,
Acee
Regards
Aamir
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