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Chapter 4 - Cisco Group Management Protocol

Cisco Multicast Routing & Switching
William R. Parkhurst
  Copyright © 1999 The McGraw-Hill Companies

CGMP Command Summary
Tables 4-2 and 4-3 contain a summary of the router and switch commands pertaining to CGMP. The router command, ip cgmp proxy, will be covered in Chapter 5, “Distance Vector Multicast Routing Protocol.”
Table 4-2: Router CGMP Command Summary
Command
Description
ip cgmp
Enables CGMP on an interface or subinterface
ip cgmp proxy
Enables CGMP and DVMRP proxy on an interface or subinterface
clear ip cgmp [interface]
Clears all CGMP groups
show ip igmp interface [interface]
Shows if CGMP is enabled on an interface
debug ip cgmp
Debugs CGMP traffic
Table 4-3: Switch CGMP Command Summary
Command
Description
set cgmp enable
Enables CGMP on the switch
set cgmp disable
Disables CGMP on the switch
show multicast router
Lists the ports on the switch that are router ports
show multicast group
Displays active groups
clear cgmp statistics
Clears the CGMP statistics
debug ip cgmp
Debugs CGMP traffic
Example
View the switch CGMP statistics for VLAN 2
switch. show cgmp statistics 2
CGMP enabled
CGMP statistics for vlan 2:
valid rx pkts received257
invalid rx pkts received0
valid cgmp joins received252
valid cgmp leaves received5
valid igmp leaves received0
valid igmp queries received0
igmp gs queries transmitted0
igmp leaves transmitted0
failures to add GDA to EARL0
topology notifications received0
number of packets dropped0
Example
Verify the CGMP is enabled on the router
routerashow ip igmp interface ethernet 0
Ethernet0 is up, line protocol is up
Internet address is 172.16.4.3/24
IGMP is enabled on interface
Current IGMP version is 2
CGMP is enabled on interface
IGMP Query Interval is 60 seconds
IGMP Querier Timeout is 120 seconds
IGMP Max. Query Response Time is 10 seconds
Inbound IGMP Access group is not set
IGMP activity: 4 joins, 2 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast Designated Router (DR) is 172.16.4.3 (this system)
IGMP Querying router is 172.16.4.1
Multicast groups joined (number of users):
224.0.1.40(1) 225.250.250.1(1)

 


 
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