Cisco Systems 3750E manual Ip msdp cache-sa-state list, 43-7

Chapter 43 Configuring MSDP

Configuring MSDP

Beginning in privileged EXEC mode, follow these steps to enable the caching of source/group pairs. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	ip msdp cache-sa-state [list	Enable the caching of source/group pairs (create an SA state). Those
	access-list-number]	pairs that pass the access list are cached.
		For list access-list-number, the range is 100 to 199.
Step 3
	access-listaccess-list-number {deny	Create an IP extended access list, repeating the command as many times
	permit} protocol source source-wildcard	as necessary.
	destination destination-wildcard	• For access-list-number, the range is 100 to 199. Enter the same
		number created in Step 2.
		• The deny keyword denies access if the conditions are matched. The
		permit keyword permits access if the conditions are matched.
		• For protocol, enter ip as the protocol name.
		• For source, enter the number of the network or host from which the
		packet is being sent.
		• For source-wildcard, enter the wildcard bits in dotted decimal
		notation to be applied to the source. Place ones in the bit positions
		that you want to ignore.
		• For destination, enter the number of the network or host to which
		the packet is being sent.
		• For destination-wildcard, enter the wildcard bits in dotted decimal
		notation to be applied to the destination. Place ones in the bit
		positions that you want to ignore.
		Recall that the access list is always terminated by an implicit deny
		statement for everything.
Step 4
	end	Return to privileged EXEC mode.
Step 5
	show running-config	Verify your entries.
Step 6
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Note An alternative to this command is the ip msdp sa-requestglobal configuration command, which causes the switch to send an SA request message to the MSDP peer when a new member for a group becomes active. For more information, see the next section.

To return to the default setting (no SA state is created), use the no ip msdp cache-sa-stateglobal configuration command.

This example shows how to enable the cache state for all sources in 171.69.0.0/16 sending to groups 224.2.0.0/16:

Switch(config)# ip msdp cache-sa-state 100

Switch(config)# access-list 100 permit ip 171.69.0.0 0.0.255.255 224.2.0.0 0.0.255.255

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-02 43-7