PCEP
340
MPLS Guide
© 2022 Nokia.
Use subject to Terms available at: www.nokia.com
3HE 18686 AAAB TQZZA
• primary/active NSP cluster failure
If the NSP cluster at the primary/active site is down (two out of three servers
must be inactive, shut down, or failed), the heartbeat mechanism between the
primary/active and secondary/standby NSP clusters fails. This initiates the NSP
cluster activity at the secondary/standby site.
The following are the activities on the VSR-NRC.
- The VSR-NRC at the primary site detects the cproto session failure and
puts all its PCEP sessions to the PCCs into the overload state.
- The NSP cluster at the secondary site establishes the cproto session to the
local VSR-NRC, which then brings its PCEP sessions out of the overload
state.
- The VSR-NRC at the secondary site begins synchronizing the TE and LSP
databases with the parent NSP cluster at the secondary site that is now the
active site.
- The VSR-NRC at the primary site must also return the delegation of all
LSPs to the PCCs by sending an empty LSP Update Request that has the
Delegate flag set to 0 as per RFC 8231. This allows the PCCs to delegate
all eligible LSPs, including PCE-initiated LSPs, to the PCE function in the
VSR-NRC at the secondary site.
• VSR-NRC complex failure at the primary site (NSP server is still up)
A VSR-NRC complex failure at the primary/active NSP site does not initiate an
NSP switchover to the secondary/standby NSP site. If the VSR-NRC at the
primary site does not recover, a manual switchover to the secondary NSP site
is required. The VSR-NRC failure causes a cproto session failure alarm to be
raised on the NSP indicating that the NSP cannot communicate with the VSR-
NRC. The operator can manually perform a switchover of the NSP activity to the
secondary site.
4.7.2.3 PCC Behavior
The following describes rules for a PCC with PCE redundancy:
• PCCs can establish upstream PCEP sessions with at most two VSR-NRC
PCEs.
Note: If the entire primary site fails, the above actions of the VSR-NRC at the primary site
do not apply; however, the remaining actions do apply.
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