Licensing requirements for rip, Guidelines and limitations – Cisco ASA 5505 User Manual

Page 483

Advertising
background image

25-3

Cisco ASA 5500 Series Configuration Guide using the CLI

Chapter 25 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.

Advertising