Cisco ASA Series User Manual

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Cisco ASA Series CLI Configuration Guide
Chapter 1 Routing Overview
Information About the Routing Table
When a combination of layer 2 and layer 3 load balancing interfaces are deployed and configured for
dynamic routing, the slave units only have partial topology and neighbor information (including details
that were obtained through layer 3 load balancing interfaces) in the routing process because only RIB
table entries are synchronized from the master unit for layer 2 load balancing interfaces. You must
configure the network to have layer 2 and layer 3 belong to different routing processes and redistribute
the load from each routing process.
Table 1-2 provides a summary of the supported configurations. Yes indicates that the combination of two
processes (one process to layer 2 and one process to layer 3) work, No indicates that the combination of
two processes does not work.
All the units in a cluster must be in the same mode: either single or multiple context mode. In multiple
context mode, the master-slave synchronization includes all the contexts and the RIB table entries of all
the contexts in the synchronization message.
In clustering, if you have configured a layer 3 interface, you must also configure the router-id pool
setting.
For more information about dynamic routing and clustering, see Chapter 1, “Configuring a Cluster of
ASAs.”
Dynamic Routing in Multiple Context Mode
In multiple context mode, each context maintains a separate routing table and routing protocol databases.
This enables you to configure OSPFv2 and EIGRP independently in each context. You can configure
EIGRP in some contexts and OSPFv2 in the same or different contexts. In mixed context mode, you can
enable any of the dynamic routing protocols in contexts that are in routed mode. RIP and OSPFv3 are
not supported in multiple context mode.
The following table lists the attributes for EIGRP, OSPFv2, route maps used for distributing routes into
OSPFv2 and EIGRP processes, and prefix lists used in OSPFv2 to filter the routing updates entering or
leaving an area when they are used in multiple context mode:
Table 1-2 Summary of Supported Configurations
Layer 2 or Layer 3 OSPF (Layer 3) EIGRP (Layer 3) RIP (Layer 3)
OSPF (layer 2) Yes Yes Yes
EIGRP (layer 2) Yes No Yes
RIP (layer 2) Yes Yes No
EIGRP OSPFv2
Route Maps
and Prefix Lists
One instance is supported per
context.
Two instances are supported per
context.
N/A
It is disabled in the system context. N/A
Two contexts may use the same
or different autonomous system
numbers.
Two contexts may use the same
or different area IDs.
N/A

Cisco ASA Series Specifications

General

Brand	Cisco
Model	ASA Series
Category	Network Hardware
Language	English