Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 646
Expiry timers for S, G entries, Static rendezvous point, Advantages of PIM-SSM, PIM-SSM
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Advantages of PIM-SSM Advantages of PIM-SSM include the following: • PIM-SSM forwards multicast traffic from a single source to a subnet. Other versions of PIM requires the receiver to subscribe to a group. The receiver receives traffic not just from the source that it is interested in, but from all the sources that send to that group. PIM-SSM requires the receiver to specify the sources in which they are interested in to avoid receiving unnecessary traffic. • PIM-SSM is more efficient than PIM-SM because it immediately creates shortest path trees (SPT) to the source rather than using shared trees. PIM-SM requires a shared tree rooted at the RP because IGMPv2 receivers do not express the source information in their membership reports. Multicast traffic passes from the source to the receiver through the RP, until the last hop router (LHR) learns the source address, at which point it switches to the SPT. PIM-SSM uses IGMPv3. Because receivers subscribe to a source and group, the RP and shared tree are unnecessary; only SPTs are used. On OS10 systems, it is possible to use PIM-SM with IGMPv3 to achieve the same result, but PIM-SSM eliminates the unnecessary protocol overhead. Configure PIM-SSM To configure a group range for PIM-SSM: NOTE: The IP range, 232.0.0.0/8 is reserved for SSM. You do not have to explicitly configure this range. 1 Create an ACL rule to specify the range of addresses that should use SSM. OS10# configure terminal OS10(config)# ip access-list ssm-1 OS10(config-ipv4-acl)# permit ip any 236.0.0.0/8 OS10(config-ipv4-acl)# exit 2 Enable PIM-SSM for the range of addresses using the ip pim ssm-range command. OS10(config)# ip pim ssm-range ssm-1 You can use the show ip pim ssm-range command to view the groups added in PIM-SSM configuration. OS10# show ip pim ssm-range Group Address / MaskLen 236.0.0.0 / 8 Expiry timers for S, G entries You can configure expiry timers for S, G entries globally. The S, G entries expire in 210 seconds by default. To configure the S, G expiry timer: OS10# configure terminal OS10(config)# ip pim sparse-mode sg-expiry-timer 500 Static rendezvous point The rendezvous point (RP) is an interface on a router that acts as the root to a group-specific tree; every group must have an RP. You must configure the RP on all nodes in your network. 646 Multicast
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1,167
-
1,168
-
1,169
-
1,170
-
1,171
-
1,172
-
1,173
-
1,174
-
1,175
-
1,176
-
1,177
-
1,178
-
1,179
-
1,180
-
1,181
-
1,182
-
1,183
-
1,184
-
1,185
-
1,186
-
1,187
-
1,188
-
1,189
-
1,190
-
1,191
-
1,192
-
1,193
-
1,194
-
1,195
-
1,196
-
1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203