Specifications

B-168
Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB
OL-21227-02
Appendix B Cisco MWR 2941 Router Command Reference
ip pim
Sparse-Dense Mode
An alternative to choosing just dense mode or just sparse mode is to run PIM in a single region in sparse
mode for some groups and dense mode for other groups.
In sparse-dense mode, if the group is in dense mode, the interface is treated as dense mode. If the group
is in sparse mode, the interface is treated in sparse mode. The group is “sparse” if the router knows about
an RP for that group.
When an interface is treated in dense mode, it is populated in the outgoing interface list of the multicast
routing table when either of the following conditions is true:
• Members or DVMRP neighbors are on the interface.
• Any of the PIM neighbors on the interface have not pruned for the group.
When an interface is treated in sparse mode, it is populated in the outgoing interface list of the multicast
routing table when either of the following conditions is true:
• Members or DVMRP neighbors are on the interface.
• A PIM neighbor on the interface has received an explicit join message.
Examples The following example shows how to enable PIM-SM on tunnel interface 0 and set the address of the
RP router to 226.0.0.8:
ip pim rp-address 226.0.0.8
interface tunnel 0
ip pim sparse-mode
The following example shows how to enable PIM dense mode (PIM-DM) on Ethernet interface 1:
interface ethernet 1
ip pim dense-mode
The following example shows how to enable PIM sparse-dense mode on Ethernet interface 1:
interface ethernet 1
ip pim sparse-dense-mode
The following example shows how to register the multicast traffic for any source and any multicast
group:
interface ethernet 0
ip address 172.16.0.0 255.255.255.0
description Ethernet interface towards the PIM sparse-mode domain
ip pim sparse-dense-mode
!
interface ethernet 1
ip address 192.44.81.5 255.255.255.0
description Ethernet interface towards the PIM dens-mode region
ip pim dense-mode proxy-register list 100
!
access-list 100 permit ip any any
Related Commands Command Description
ip multicast-routing Enables IP multicast routing or multicast distributed switching.
ip pim neighbor-filter Filters PIM messages.