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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 28 Configuring RIP
Licensing Requirements for RIP
simultaneously attempting to update their neighbors. Each routing table entry has a route-timeout timer
associated with it. When the route-timeout timer expires, the route is marked invalid but is retained in
the table until the route-flush timer expires.
Licensing Requirements for RIP
The following table shows the licensing requirements for this feature:
Guidelines and Limitations
This section includes the guidelines and limitations for this feature.
Context Mode Guidelines
Supported in single context mode only.
Firewall Mode Guidelines
Supported in routed and transparent firewall mode.
IPv6 Guidelines
Does not support IPv6.
Additional Guidelines
The following information applies to RIP Version 2 only:
• If using neighbor authentication, the authentication key and key ID must be the same on all neighbor
devices that provide RIP Version 2 updates to the interface.
• With RIP Version 2, the ASA transmits and receives default route updates using the multicast
address 224.0.0.9. In passive mode, it receives route updates at that address.
• When RIP Version 2 is configured on an interface, the multicast address 224.0.0.9 is registered on
that interface. When a RIP Version 2 configuration is removed from an interface, that multicast
address is unregistered.
Limitations
• The ASA cannot pass RIP updates between interfaces.
• RIP Version 1 does not support variable-length subnet masks.
• RIP has a maximum hop count of 15. A route with a hop count greater than 15 is considered
unreachable.
• RIP convergence is relatively slow compared to other routing protocols.
• You can only enable a single RIP process on the ASA.
Model License Requirement
All models Base License.