Partition Repair Guidelines - Alcatel-Lucent 1643 AMS User's Operation Manual

Management communication setup

Partition repair guidelines

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When to use partition repair
Only provision nodes to be
Failure otherwise cannot be avoided for that area. If more than one Level-2 entry into
an area is used, partition repair is a valid mechanism.
No p arti tio n rep air n eeded , w hen a Lev el -1 r in g
in an ar ea i s u s ed. A fi ber -c ut do es n ot
par titi on th e ar ea, and th e l ev el-2 no des s ho ul d
NOT b e p ro v is i on ed to be par titi on r epai r
c apab le.
How to use partition repair
To allow the healing of a partitioned area, two nodes must be provisioned as Partition
Repair Capable as follows:
• At the area boundary, connecting Level-2 node(s) in (an) other area(s)
• The potential virtual link (tunnel) should reduce the SPF's in the area to a
minimum.
In case an area is partitioned due to a single failure, the two partition repair capable
level-2 nodes in each partition will establish a level-1 tunnel through the level-2
subdomain, in order to repair level-1 connectivity between all nodes in the two related
partitions.
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4-30
Partition Repair Capable
WRONG
O S
P P
Legend:
A Level-2 node / router
A Level-1 node / router
P
A Partition Repair Capable Level-2 node / router
Level-1+2 link
data-communication link (level-1)
Level-1 tunnel through the Level-2 subdomain
Level-1 subnetwork
LAN
Level-2 LAN
Alcatel-Lucent - Proprietary
See notice on first page
in an area, if a Single Point of
CORRECT
O S
par titi on r epai r is no t
need ed, b ec aus e a
ri ng i s u s ed in eac h
area
O S
p arti tio n rep air i s
n eeded : n o lev el -1
r in g in th e ar ea.
P
P
OS
N o par titi on r epai r
i s n eeded , bec au s e
th e ex ter nal r ou ter
c l os es the lev el -1
r in g.
R O U TER C IS C O
365-312-807R7.2
Issue 4, May 2007