Configuring An Nbma Neighbor; Configuring A Router Priority For An Ospf Interface; Configuring Ospf Routing Information Control; Prerequisites - 3Com MSR 50 Series Configuration Manual

942 C 58: OSPF C
HAPTER
Configuring an NBMA
Neighbor
Configuring a Router
Priority for an OSPF
Interface
Configuring OSPF
Routing Information
Control

Prerequisites

ONFIGURATION
If the two interfaces on a link are both configured as the broadcast, NBMA or
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P2MP type, they cannot establish neighbor relationship unless they are on the
same network segment.
For NBMA interfaces that cannot broadcast hello packets to find neighbors, you
need to specify IP addresses and DR priorities of neighbors manually.
Follow these steps to configure a neighbor and its DR priority:
To do...
Enter system view
Enter OSPF view
Specify an NBMA neighbor
and its DR priority
For broadcast or NBMA interfaces, you can configure router priorities for DR/BDR
election.
Follow these steps to configure a router priority for an OSPF interface:
To do...
Enter system view
Enter interface view
Configure a router priority for
the interface
n
The DR priority configured with the ospf dr-priority command and the one with
the peer command have the following differences
The former is for actual DR election.
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The latter is to indicate whether a neighbor has election right or not. If you
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configure the DR priority for a neighbor as 0, the local router will consider the
neighbor has no election right, thus no hello packet is sent to this neighbor,
reducing the number of hello packets for DR/BDR election on networks.
However, if the local router is the DR or BDR, it will send a hello packet to the
neighbor with priority 0 for adjacency relationship establishment.
This section is to configure management for OSPF routing information
advertisement and reception, and route redistribution from other protocols.
To configure this task, you have configured:
IP addresses for interfaces
■
OSPF basic functions
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Corresponding filters if routing information filtering is needed.
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Use the command...
system-view
ospf [ process-id | router-id router-id |
vpn-instance instance-name ]*
peer ip-address [ dr-priority dr-priority ]
Use the command...
system-view
interface interface-type
interface-number
ospf dr-priority priority
Remarks
-
-
Required
Remarks
-
-
Optional
The default router priority is 1