Setting The Dscp Value For Ospf Packets; Enabling Ospf Ispf; Configuring Ospf Graceful Restart; Configuring The Ospf Gr Restarter - HP 6125G Configuration Manual

Setting the DSCP value for OSPF packets

An IPv4 packet header contains an 8-bit TOS field. As defined in RFC 2474, the first six bits set the
Differentiated Services Code Point (DSCP) value and the last two bits are reserved. Network devices use
the DSCP value as a reference to determine the packet priority for transmission.
You can set the DSCP value for OSPF packets.
To set the DSCP value for OSPF packets:
Step
1. Enter system view.
2. Enable an OSPF
process and enter
OSPF view.
3. Set the DSCP value
for OSPF packets.

Enabling OSPF ISPF

When a network topology is changed, Incremental Shortest Path First (ISPF) allows the system to
recomputes only the affected part of the shortest path tree (SPT), instead of the entire SPT.
To enable OSPF ISPF:
Step
1. Enter system view.
2. Enter OSPF view.
3. Enable OSPF ISPF.

Configuring OSPF Graceful Restart

OSPF GR involves the following:
IETF standard GR—Uses Opaque LSAs to implement GR.
•
• Non IETF standard GR—Uses link local signaling (LLS) to advertise GR capability and uses out of
band synchronization to synchronize the LSDB.
A device can act as a GR Restarter and GR Helper at the same time.

Configuring the OSPF GR Restarter

You can configure the IETF standard or non IETF standard OSPF GR Restarter.
Configuring the IETF standard OSPF GR Restarter
Command
system-view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
dscp dscp-value
Command
system-view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
ispf enable
86
Remarks
N/A
By default, OSPF is not enabled.
Optional.
By default, the DSCP value in OSPF
packets is 48.
Remarks
N/A
N/A
Optional.
Disabled by default.