Limiting How Long An Sdr Cache Entry Exists; Configuring An Ip Multicast Boundary - Cisco Catalyst 3750 Software Configuration Manual
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Configuring Optional Multicast Routing Features
Limiting How Long an sdr Cache Entry Exists
By default, entries are never deleted from the sdr cache. You can limit how long the entry remains active
so that if a source stops advertising SAP information, old advertisements are not needlessly kept.
Beginning in privileged EXEC mode, follow these steps to limit how long an sdr cache entry stays active
in the cache. This procedure is optional.
Command
Step 1
configure terminal
Step 2
ip sdr cache-timeout minutes
Step 3
end
Step 4
show running-config
Step 5
copy running-config startup-config
To return to the default setting, use the no ip sdr cache-timeout global configuration command. To
delete the entire cache, use the clear ip sdr privileged EXEC command.
To display the session directory cache, use the show ip sdr privileged EXEC command.
Configuring an IP Multicast Boundary
Administratively-scoped boundaries can be used to limit the forwarding of multicast traffic outside of a
domain or subdomain. This approach uses a special range of multicast addresses, called
administratively-scoped addresses, as the boundary mechanism. If you configure an
administratively-scoped boundary on a routed port, multicast traffic whose multicast group addresses
fall in this range can not enter or exit this port, thereby providing a firewall for multicast traffic in this
address range.
Multicast boundaries and TTL thresholds control the scoping of multicast domains; however, TTL
Note
thresholds are not supported by the switch. You should use multicast boundaries instead of TTL
thresholds to limit the forwarding of multicast traffic outside of a domain or a subdomain.
Figure 31-5
address range 239.0.0.0/8 on all routed ports at the perimeter of its network. This boundary prevents any
multicast traffic in the range 239.0.0.0 through 239.255.255.255 from entering or leaving the network.
Similarly, the engineering and marketing departments have an administratively-scoped boundary of
239.128.0.0/16 around the perimeter of their networks. This boundary prevents multicast traffic in the
range of 239.128.0.0 through 239.128.255.255 from entering or leaving their respective networks.
Catalyst 3750 Metro Switch Software Configuration Guide
31-34
Purpose
Enter global configuration mode.
Limit how long an sdr cache entry stays active in the cache.
By default, entries are never deleted from the cache.
For minutes, the range is 1 to 4294967295.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
shows that Company XYZ has an administratively-scoped boundary set for the multicast
Chapter 31
Configuring IP Multicast Routing
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