Nsp Cluster Redundancy; Vsr-Nrc Redundancy - Nokia 7705 SAR-W Series Manual

MPLS Guide
4.7.2.1
The following describes NSP cluster redundancy rules.
4.7.2.2
The following describes VSR-NRC redundancy rules:
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NSP Cluster Redundancy

• At a single site, a master is elected among the cluster of three VMs. Between
sites, a single cluster at one site is the primary/active site and the other DR site
is the secondary/standby site.
• The application processes at the standby site are shut down but the Neo4j and
other databases are synchronized with the primary/active site.
• Switching to the standby site can be initiated manually or by using an automated
approach stemming from the loss of heartbeat between the primary and standby
sites.
• 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 and standby NSP clusters fails after three timeouts. This initiates the
active role at the secondary/standby site.
• When the NSP cluster at the primary site is back up, the heartbeat mechanism
between the primary/standby and secondary/active NSP clusters is restored.
The primary site can be manually restored as the active site. Automatic
reversion to the primary NSP cluster is not supported.

VSR-NRC Redundancy

• steady state behavior
- The VSR-NRC at the secondary/standby site, in the same way as the VSR-
NRC at the primary/active site, establishes PCEP sessions to the PCCs.
However, the VSR-NRC at the standby site has its PCEP sessions to the
PCCs in the overload state. The VSR-NRC enters this PCEP overload state
when its upstream cproto session to the NSP cluster is down, resulting from
either the NSP cluster going into the standby state or the cproto session
failing.
- The VSR-NRC acting as a PCE signals the overload state to the PCCs in a
PCEP notification message. In the overload state, the VSR-NRC PCE
accepts reports (PCRpt) without delegation but rejects requests (PCReq)
and rejects reports (PCRpt) with delegation. The VSR-NRC PCE also does
not originate initiate messages (PCInitiate) or update messages (PCUpd).
- The VSR-NRC at the secondary/standby site maintains its BGP and IGP
peerings with the network and updates its TE database as a result of any
network topology changes.
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