TMS zl Management and Configuration Guide ST.1.0.090213

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Overview
Routing
By default, the TMS zl Module firewall allows all RIP updates between any
zone and the Self zone. For greater security, the TMS zl Module supports these
types of RIP authentication:
■ Simple password
■ MD5
You can also modify firewall access policies to further secure routing mes-
sages.
For more information and for instructions on configuring this feature, see
“RIP” in Chapter 9: “Routing.”
OSPF
The TMS zl Module supports all fives types of OSPF Link State Advertisements
(LSAs). You can place one or more TMS VLANs in one or more of these types
of OSPF areas:
■ Backbone area and normal areas
■ Stub areas
Stub areas connect only to the backbone. They receive summary routes
to other areas (type 3 LSAs) instead of advertisements to specific net-
works in other areas.
■ Totally stub areas
These stub areas do not receive summary routes to other areas. Instead
they receive a default route for all inter-area and external traffic from their
Area Border Router.
■ Not so stubby areas (NSSAs)
NSSAs are stub or totally stub areas (depending on whether they receive
inter-area summary routes) that are allowed to receive external and
redistributed routes (type 5 LSAs). NSSAs are typically used so that a stub
area can provide the connection to the Internet.
When you enable OSPF on a TMS VLAN, you specify the area ID for that VLAN,
which also creates the area. You must then define the area as stub, totally stub
(that is, stub with no summary), or NSSA. If the area is the backbone (area
ID 0) or a normal area, you do not have to perform any configuration beyond
specifying the ID when you enable OSPF on a VLAN.