TMS zl Management and Configuration Guide ST.1.0.090213

9-38
Routing
OSPF
Table 9-16. OSPF Parameters
To configure OSPF on the TMS zl Module, which is an ABR by default, you
must do the following:
■ Enable OSPF
■ Set the router ID
■ Set RFC 1583 compatibility
■ Set the administrative distance
■ Set route redistribution
■ Enable OSPF on VLANs and set their area
Parameter OSPF Specification Configuration Considerations
Information in
updates
• Local area LSAs—connection to a peer:
– peer’s router ID
– metric
• Local area LSAs—connection to a network:
– network address
– metric
• Link summaries (ABRs)
• External (redistributed) routes (ASBRs)
• Setting the router ID (page 9-40)
• Redistributing routes (page 9-41)
• Enabling OSPF on a VLAN (page 9-42)
• Setting a VLAN’s cost (page 9-43)
• Setting the cost for default routes sent into stub
areas (page 9-46)
The routers that
send and
receive LSAs
and other
messages
• Routers in a multi-access network (such as an
Ethernet VLAN) send LSAs to a DR and BDR.
• DRs flood LSAs to other routers in the multi-
access network.
• ABRs send link summaries for the range of
networks in an area.
• ASBRs send external routes to routers in non-
stub areas.
• OSPF interfaces in different areas do not
exchange LSAs.
• Stub routers do not receive external routes.
• Routers reject unauthorized OSPF packets.
• Enabling OSPF on a VLAN (page 9-42)
• Establishing an area (page 9-44)
• Defining a stub area (page 9-44)
• Optional:
– Changing a router’s priority for being elected
DR (page 9-44)
– Configuring OSPF authentication (page 9-34)
Metric
computation
On the TMS zl Module, set manually (default 1). Setting a VLAN’s cost (page 9-43)
When routers
send LSAs and
other messages
• Routers send LSAs:
– not more than every 5 seconds
– not less than every 4 minutes
– when topology changes
• Routers send:
– an ACK when they receive a LSA
– a hello every 10 seconds
• Optional: Altering hello and dead intervals (page
9-33)