Cisco Systems 78-11741-02 Wireless Office Headset User Manual


 
Configuring IP Multicast Routing
IP Multicast Configuration Examples
IPC-451
Cisco IOS IP Configuration Guide
Inconsistent candidate RP selection between Cisco and non-Cisco RFC 2362-compliant routers in the
same domain if multiple candidate RPs with partially overlapping group address ranges are configured
can occur. Inconsistent candidate RP selection can lead to disconnectivity between sources and receivers
in the PIM domain. A source may register with one candidate RP and a receiver may connect to a
different candidate RP even though it is in the same group.
The following example shows a configuration that can cause inconsistent RP selection between a Cisco
and a non-Cisco router in a single PIM domain with PIM Version 2 BSR:
access-list 10 permit 224.0.0.0 7.255.255.255
ip pim rp-candidate ethernet1 group-list 10 priority 20
access-list 20 permit 224.0.0.0 15.255.255.255
ip pim rp-candidate ethernet2 group-list 20 priority 10
In this example, a candidate RP on Ethernet interface 1 announces a longer group prefix of 224.0.0.0/5
with a lower priority of 20. The candidate RP on Ethernet interface 2 announces a shorter group prefix
of 224.0.0.0/4 with a higher priority of 10. For all groups that match both ranges a Cisco router will
always select the candidate RP on Ethernet interface 1 because it has the longer announced group prefix.
A non-Cisco fully RFC 2362-compliant router will always select the candidate RP on Ethernet
interface 2 because it is configured with a higher priority.
To avoid this interoperability issue, do not configure different candidate RPs to announce partially
overlapping group address prefixes. Configure any group prefixes that you want to announce from more
than one candidate RP with the same group prefix length.
The following example shows how to configure the previous example so that there is no incompatibility
between a Cisco router and a non-Cisco router in a single PIM domain with PIM Version 2 BSR:
access-list 10 permit 224.0.0.0 7.255.255.255
ip pim rp-candidate ethernet1 group-list 10 priority 20
access-list 20 permit 224.0.0.0 7.255.255.255
access-list 20 permit 232.0.0.0 7.255.255.255
ip pim rp-candidate ethernet2 group-list 20 priority 10
In this configuration the candidate RP on Ethernet interface 2 announces group address 224.0.0.0/5 and
232.0.0.0/5 which equal 224.0.0.0/4, but gives the interface the same group prefix length (5) as the
candidate RP on Ethernet 1. As a result, both a Cisco router and an RFC 2362-compliant router will
select the RP Ethernet interface 2.
RTP Header Compression Examples
The following example enables RTP header compression for a serial, ISDN, or asynchronous interface.
For ISDN, you also need a broadcast dialer map.
interface serial 0 :or interface bri 0
ip rtp header-compression
encapsulation ppp
ip rtp compression-connections 25
The following Frame Relay encapsulation example shows how to enable RTP header compression on the
specified map.
interface serial 0
ip address 1.0.0.2 255.0.0.0
encapsulation frame-relay