HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 382
Setting the Snooping Method, Snooping on IGMP queries, Protocol Independent Multicast PIM packets
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Configuring IGMP Snooping Chapter 18 Configuring IGMP Snooping and MVR Step 3 Step 4 Command end copy running-config startup-config Purpose Return to privileged EXEC mode. (Optional) Save your entries in the configuration file. To disable IGMP snooping on a VLAN interface, use the no ip igmp snooping vlan vlan-id global configuration command for the specified VLAN number. Setting the Snooping Method Multicast-capable router ports are added to the forwarding table for every Layer 2 multicast entry. The switch learns of such ports through one of these methods: • Snooping on IGMP queries, Protocol Independent Multicast (PIM) packets, and Distance Vector Multicast Routing Protocol (DVMRP) packets • Listening to Cisco Group Management Protocol (CGMP) packets from other routers • Statically connecting to a multicast router port with the ip igmp snooping mrouter global configuration command You can configure the switch either to snoop on IGMP queries and PIM/DVMRP packets or to listen to CGMP self-join or proxy-join packets. By default, the switch snoops on PIM/DVMRP packets on all VLANs. To learn of multicast router ports through only CGMP packets, use the ip igmp snooping vlan vlan-id mrouter learn cgmp global configuration command. When this command is entered, the router listens to only CGMP self-join and CGMP proxy-join packets and to no other CGMP packets. To learn of multicast router ports through only PIM-DVMRP packets, use the ip igmp snooping vlan vlan-id mrouter learn pim-dvmrp global configuration command. Note If you want to use CGMP as the learning method and no multicast routers in the VLAN are CGMP proxy-enabled, you must enter the ip cgmp router-only command to dynamically access the router. Beginning in privileged EXEC mode, follow these steps to alter the method in which a VLAN interface dynamically accesses a multicast router: Step 1 Step 2 Command configure terminal ip igmp snooping vlan vlan-id mrouter learn {cgmp | pim-dvmrp} Step 3 Step 4 Step 5 end show ip igmp snooping copy running-config startup-config Purpose Enter global configuration mode. Enable IGMP snooping on a VLAN. The VLAN ID range is 1 to 1001 and 1006 to 4094. Specify the multicast router learning method: • cgmp-Listen for CGMP packets. This method is useful for reducing control traffic. • pim-dvmrp-Snoop on IGMP queries and PIM-DVMRP packets. This is the default. Return to privileged EXEC mode. Verify the configuration. (Optional) Save your entries in the configuration file. 18-8 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide OL-8915-01
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