RGMP, Router-port Group Management Protocol

Description Glossary RFCs Publications Obsolete RFCs


Protocol suite: TCP/IP.
Type:Transport layer multicasting protocol.
IP protocol:2.
Multicast address:
Base protocol: IGMP, Internet Group Management Protocol.
Working groups:
Links: IGMP type numbers.

A protocol developed by Cisco Systems, Inc. for use between multicast routers and switches to restrict multicast packet forwarding in switches to those routers where the packets may be needed. RGMP is designed for backbone switched networks where multiple, high speed routers are interconnected.

MAC header IP header RGMP header Data :::

RGMP header:

0001020304050607 0809101112131415 1617181920212223 2425262728293031
Type reserved Checksum
Group Address
Data :::

Type. 8 bits.

0xFCLeave a group.
0xFDJoin a group.

reserved. 8 bits.
Always cleared to 0.

Checksum. 16 bits.
This field covers the RGMP message. The algorithm and handling of the checksum are the same as those for IGMPv3.

Group Address. 32 bits.
In an RGMP Hello or Bye message, the field is cleared to zero. In an RGMP Join or Leave message, the group address field holds the IPv4 multicast group address of the group being joined or left.



[RFC 3488] Cisco Systems Router-port Group Management Protocol (RGMP).


Obsolete RFCs:

Description Glossary RFCs Publications Obsolete RFCs