Supported Ospf Features - HP 4800G Series Configuration Manual

Figure 1-20 NSSA external LSA format

Supported OSPF Features

Multi-process
With multi-process support, multiple OSPF processes can run on a router simultaneously and
independently. Routing information interactions between different processes seem like interactions
between different routing protocols. Multiple OSPF processes can use the same RID.
An interface of a router can only belong to a single OSPF process.
Authentication
OSPF supports authentication on packets. Only packets that pass the authentication are received. If
hello packets cannot pass authentication, no neighbor relationship can be established.
The authentication type for interfaces attached to a single area must be identical. Authentication types
include non-authentication, plaintext authentication and MD5 ciphertext authentication. The
authentication password for interfaces attached to a network segment must be identical.
OSPF Graceful Restart
For GR information, refer to GR Overview in the High Availability Volume.
After an OSPF GR Restarter restarts, it needs to perform the following two tasks in order to
re-synchronize its LSDB with its neighbors.
To obtain once again effective OSPF neighbor information (assume the adjacencies are not
changed).
To obtain once again the LSDB.
After restart, the GR Restarter negotiates GR capability with its neighbors and sends an OSPF GR
signal to its GR-capable neighbors so that they will not remove their adjacencies with it and advertise
the adjacencies. The GR Restarter re-establishes neighborships and updates its own routing table and
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