show rsvp fast-reroute

[Tiziano Tofoni]

I'm sure mine is a trivial question but I can't find any explanation on Cisco IOS XR docs.

The following is a sample of "show rsvp fast-reroute" command:

RP/0/0/CPU0:CS11# show rsvp fast-reroute

. . .

Type     Destination TunID          Source       PSBs       RSBs

---- --------------- ----- --------------- ---------- ----------

LSP4    192.168.1.21  1121    192.168.1.11      Ready      Ready

LSP4    192.168.1.21  1221    192.168.1.12      Ready      Ready

My question is the following: what is the meaning of the PSB and RSB acronyms ? I guess that PS stands for Path State and RS for Resv State. Am i correct ? And how about the B ???

Thanks a lot in advance for your help.

Tiziano

[Charles Hill · Accepted solution]

Hello,

PSB = path state block

RSB = reservation state block

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/gsrsvp29.html

Table 2 show ip rsvp counters state teardown Field Descriptions  

Field	Description
States	RSVP state including path state block (PSB) and reservation state block (RSB) information.
Reason for Teardown	Event triggering the teardown.

Hope this helps

Please rate helpful posts

Thanks

[Tiziano Tofoni]

Charles, one more question, what is the meaning of PSB and RSB ? Why do they call "block" ?

Thanks a lot for your kindness

[Tiziano Tofoni]

Found the answer in RFC 3209 !!!

 When the EXPLICIT_ROUTE object (ERO) is present, the Path message is
   forwarded towards its destination along a path specified by the ERO.
   Each node along the path records the ERO in its path state block.
   Nodes may also modify the ERO before forwarding the Path message.  In
   this case the modified ERO SHOULD be stored in the path state block
   in addition to the received ERO.

[Charles Hill]

Good job!  I was still searching.

(+5)

[Tiziano Tofoni]

Thanks a lot Charles. I am wondering why they (Cisco guys) do not a List of Acronyms at the end of the documentation.

[Charles Hill]

I don't know, but it sure would be nice!

it would save a lot of head scratching.