Introduction to Cisco router-specific protocols

RGMP is designed to be used in combination with the multicast routing selection protocol that supports the distribution tree Join/Prune. The typical protocol is PIM-SM.

The RGMP protocol only specifies the IPv4 multicast route selection operation, excluding IPv6. The Cisco router port Group Management Protocol makes up for the shortcomings of the Internet group management protocol in the snoopIng technical mechanism.

1. The RGMP protocol acts on the relationship between multicast routers and vswitches. Through RGMP, multicast packets forwarded in vswitches can be fixed in the desired vro. RGMP is designed to be used in backbone exchange with multiple vrouters. Its technical limitations are mainly reflected in: in this technology, multicast traffic can only be fixed between receivers and exchange ports directly or indirectly connected through other switches. In the Igmp snoopIng technology, multicast traffic cannot be fixed at least on the port connected to a multicast router, resulting in the spread of multicast traffic on these ports.

Ii. Igmps noopIng is an inherent limitation of the mechanism. Based on this, the vro cannot report the traffic status. Therefore, the vswitch can only know the multicast traffic type requested by the host, but does not know the traffic type received by the vro port, the RGMP protocol allows you to set multicast traffic to vro ports. To efficiently implement traffic fixation, both network switches and routers must support RGMP.

Through RGMP, the backbone switch can know the group type required by each port, and then the multicast router sends the information to the switch. However, the router only sends RGMP information, while ignoring the received RGMP information.

3. When the Group no longer needs to receive communication traffic, the router will send an RGMP Exit message. In RGMP, the network switch needs to consume the network port to reach RGMP information and process it. In addition, switches in RGMP cannot forward/spread the received RGMP information to other network ports, RGMP is designed to be used in combination with the multicast routing selection protocol that supports the distribution tree joIn/prune.

If you want to know the information of certain route entries, You can append the address of the preceding route entries to the request information, devices that receive such request information process these route entries one by one and establish response information. If the device that receives the request information has these route entries.