18-5
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 18 Information About Routing
Supported Internet Protocols for Routing
This issue has a high probability in same security traffic configuration, where virtually any traffic may
be either source-translated or destination-translated, depending on direction of initial packet in the flow.
When this issue occurs after a route flap, it can be resolved manually by using the clear xlate command,
or automatically resolved by an XLATE timeout. XLATE timeout may be decreased if necessary. To
ensure that this rarely happens, make sure that there is no route flaps on adaptive security appliance and
around it. That is, ensure that destination translated packets that belong to the same flow are always
forwarded the same way through the adaptive security appliance.
Supported Internet Protocols for Routing
The adaptive security appliance supports several internet protocols for routing. Each protocol is briefly
described in this section.
• Enhanced Interior Gateway Routing Protocol (EIGRP)
EIGRP provides compatibility and seamless interoperation with IGRP routers. An
automatic-redistribution mechanism allows IGRP routes to be imported into Enhanced IGRP, and
vice versa, so it is possible to add Enhanced IGRP gradually into an existing IGRP network.
For more information about configuring EIGRP, see the “Configuring EIGRP” section on page 23-3.
• Open Shortest Path First (OSPF)
Open Shortest Path First (OSPF) is a routing protocol developed for Internet Protocol (IP) networks
by the interior gateway protocol (IGP) working group of the Internet Engineering Task Force
(IETF). OSPF uses a link-state algorithm to build and calculate the shortest path to all known
destinations. Each router in an OSPF area includes an identical link-state database, which is a list
of each of the router usable interfaces and reachable neighbors.
For more information about configuring OSPF, see the “Configuring OSPF” section on page 21-3.
• Routing Information Protocol
The Routing Information Protocol (RIP) is a distance-vector protocol that uses hop count as its
metric. RIP is widely used for routing traffic in the global Internet and is an interior gateway
protocol (IGP), which means that it performs routing within a single autonomous system.
For more information about configuring RIP, see the “Configuring RIP” section on page 22-3.
Information About the Routing Table
This section includes the following topics:
• Displaying the Routing Table, page 18-5
• How the Routing Table Is Populated, page 18-6
• How Forwarding Decisions are Made, page 18-7
Displaying the Routing Table
To show all routes in ASDM that are in the routing table, choose Monitoring > Routing > Routes.
In this table, each row represents one route.
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