HP 3500YL - Manual (Page 234)

IP Routing Features
Configuring OSPF
12. Optional: Configure OSPF interface authentication.
13. Configure virtual links for any areas not directly connected to the back­
bone.
Configuration Rules
■ If the switch is to operate as an ASBR, you must enable redistribution
(step 7 on page 5-59). When you do that, ASBR capability is automatically
enabled. For this reason, you should first configure redistribution filters
on the ASBR. Otherwise, all possible external routes will be allowed to
flood the domain. (Refer to “7. Optional: Configure for External Route
Redistribution in an OSPF Domain” on page 5-73.)
■ Each VLAN interface on which you want OSPF to run must be assigned
to one of the defined areas. When a VLAN interface is assigned to an area,
the IP address is automatically included in the assignment. To include
additional addresses, you must enable OSPF on them separately, or use
the “all” option in the assignment.
OSPF Global and Interface Settings
When first enabling OSPF, you may want to consider configuring ranges and
restricting redistribution (if an ASBR is used) to avoid unwanted advertise­
ments of external routes. You may also want to enable the OSPF trap and
authentication features to enhance troubleshooting and security. However, it
is generally recommended that the remaining parameters with non-null
default settings be left as-is until you have the opportunity to assess OSPF
operation and determine whether any adjustments to non-default settings is
warranted.
The following tables list the global and per-interface commands used with
OSPF. For information on when to use these commands, refer to “General
Configuration Steps for OSPF” on page 5-59. For detailed information on each
command, refer to the page listed for each command.
Table 5-6. OSPF Default Global Settings
Parameter Default Page
area < area-# > virtual-link < ip-addr > None
default-metric 10
distance < external | inter-area | intra-area > 110
range All IP Addresses
redistribute Disabled
5-60