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Re: [PWE3] some question about the PW redundancy
Hi Fei,
I
do not believe this question was answered.
The scenario below is for protecting against AC and PE failures. Thus,
the redundant PWs terminate on two different remote PEs and the advertised
'active/standby' forwarding state in the PW status TLV reflects the forwarding
state of the AC.
It is assumed that protection against network failures uses other
mechanisms such as LSP FRR or secondary backup.
Regards,
Mustapha.
Hi，Muley:
You described the scenario below in the draft about the PW
redundancy, and discussed the scheme to protect AC or PE
failures.
But what if the working PW
failured?
For example, assumed that
AC1/PW4/AC4 is active now. Which PW(PW1/PW2/PW3) should be actived to
transport the services if the linkd of PW4 is broken?
How to select?
|<-------------- Emulated Service
---------------->|
|
|
|
|<------- Pseudo Wire ------>|
|
| |
| |
| | |<-- PSN
Tunnels-->| | |
| V V
V V
|
V
AC1 +----+
+----+ AC3 V
+-----+
| |....|.......PW1........|....| |
+-----+
| |----------| PE1|......
.........| PE3|----------| |
| CE1 |
+----+ \ / PW3
+----+ | CE2 |
|
| +----+ X
+----+ |
|
| |
| |....../ \..PW4....| |
| |
| |----------| PE2|
| PE4|---------
| |
+-----+ |
|....|.....PW2..........|....| | +-----+
AC2 +----+
+----+
AC4
Best regards
Fei
:)