Controlling Source Information That Your Switch Forwards - Cisco Catalyst 9500 series Configuration Manual

Controlling Source Information that Your Switch Forwards

Step 4
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Step 6
Step 7
Controlling Source Information that Your Switch Forwards
By default, the Device forwards all SA messages it receives to all its MSDP peers. However, you can prevent
outgoing messages from being forwarded to a peer by using a filter or by setting a time-to-live (TTL) value.
Using a Filter
By creating a filter, you can perform one of these actions:
Routing Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9500 Switches)
36
Command or Action
access-list access-list-number {deny |
permit} source [source-wildcard]
Example:
Device(config)# access-list 1
permit 192.4.22.0 0.0.0.255
end
Example:
Device(config)# end
show running-config
Example:
Device# show running-config
copy running-config startup-config
Example:
Device# copy running-config
startup-config
Purpose
Creates an IP standard access list, repeating the
command as many times as necessary.
• For access-list-number, the range is 1 to 99.
• The deny keyword denies access if the conditions
are matched. The permit keyword permits access
if the conditions are matched.
• For source, enter the number of the network or
host from which the packet is being sent.
• (Optional) 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.
Recall that the access list is always terminated by an
implicit deny statement for everything.
Returns to privileged EXEC mode.
Verifies your entries.
(Optional) Saves your entries in the configuration file.
Configuring MSDP