3Com Switch 4800G 24-Port Configuration Manual page 665

[SwitchE] display pim bsr-info
Elected BSR Address: 192.168.9.2
Priority: 0
Hash mask length: 30
State: Elected
Scope: Not scoped
Uptime: 00:00:18
Next BSR message scheduled at: 00:01:52
Candidate BSR Address: 192.168.9.2
Priority: 0
Hash mask length: 30
State: Pending
Scope: Not scoped
Candidate RP: 192.168.9.2(Vlan-interface102)
Priority: 0
HoldTime: 150
Advertisement Interval: 60
Next advertisement scheduled at: 00:00:48
To view the RP information discovered on a switch, use the display pim rp-info
command. For example:
# View the RP information on Switch A.
[SwitchA] display pim rp-info
Vpn-instance: public net
PIM-SM BSR RP information:
Group/MaskLen: 225.1.1.0/24
RP: 192.168.9.2
Priority: 0
HoldTime: 150
Uptime: 00:51:45
Expires: 00:02:22
Assume that Host A needs to receive information addressed to the multicast group
G (225.1.1.1/24). An RPT will be built between Switch A and Switch E. When the
multicast source S (10.110.5.100/24) registers with the RP, an SPT will be built
between Switch D and Switch E. Upon receiving multicast data, Switch A
immediately switches from the RPT to the SPT. Switches on the RPT path (Switch A
and Switch E) have a (*, G) entry, while switches on the SPT path (Switch A and
Switch D) have an (S, G) entry. You can use the display pim routing-table
command to view the PIM routing table information on the switches. For example:
# View the PIM routing table information on Switch A.
[SwitchA] display pim routing-table
Total 1 (*, G) entry; 1 (S, G) entry
(*, 225.1.1.1)
RP: 192.168.9.2
Protocol: pim-sm, Flag: WC
UpTime: 00:13:46
Upstream interface: Vlan-interface102,
Upstream neighbor: 192.168.9.2
RPF prime neighbor: 192.168.9.2
Downstream interface(s) information:
Total number of downstreams: 1
1: Vlan-interface100
Protocol: igmp, UpTime: 00:13:46, Expires:00:03:06
(10.110.5.100, 225.1.1.1)
RP: 192.168.9.2
Protocol: pim-sm, Flag: SPT ACT
PIM Configuration Examples 665