Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 44)

32 Multi-Service IronWare Multicast Configuration Guide
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PIM Dense
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Failover time in a multi-path topology
When a port in a multi-path topology fails, multicast devices, depending on the routing protocol
being used, take a few seconds to establish a new path, if the failed port is the input port of the
downstream device.
Modifying the TTL threshold
The TTL threshold defines the minimum value required in a packet for it to be forwarded OUT of the
interface AFTER the TTL has been decremented.
For example, if the TTL for an interface is set at 10, only those packets that enter with a TTL value
of 11 or more are forwarded through the TTL-10 interface. With a default TTL threshold of 1, only
packets ingressing with a TTL of 2 or greater are forwarded. The TTL threshold only applies to
routed interfaces and is ignored by switched interfaces. Possible TTL values are 1 to 64. The
default TTL value is 1.
To configure a TTL of 45, enter a command such as the following.
Brocade(config-if-e10000-3/24)# ip pim ttl-threshold 45
Syntax: [no] ip pim ttl-threshold 1-64
Configuring a DR priority
The DR priority option lets you give preference to a particular device in the DR election process by
assigning it a numerically higher DR priority. This value can be set for IPv4 and IPv6 interfaces. To
set a DR priority higher than the default value of 1, use the ip pim dr-priority command as shown:
For IPv4.
Brocade(config-if-e10000-3/24)# ip pim dr-priority 50
For IPv6.
Brocade(config-if-e10000-3/24)# ipv6 pim dr-priority 50
Syntax: [no] ip pim dr-priority priority-value
Syntax: [no] ipv6 pim dr-priority priority-value
The priority-value variable is the value that you want to set for the DR priority. Optional values are: 0
- 65535. The default value is 1.
The no option removes the command and sets the DR priority back to the default value of 1.
The following information may be useful for troubleshooting.
Total number of IP routes: 19
Type Codes - B:BGP D:Connected I:ISIS S:Static R:RIP O:OSPF Cost - Dist/Metric
Destination Gateway Port Cost Type
..
172.17.41.4 137.80.127.3 v11 2 O
172.17.41.4 137.80.126.3 v10 2 O
172.17.41.4 137.80.129.1 v13 2 O
172.17.41.4 137.80.128.3 v12 2 O
172.17.41.8 0.0.0.0 1/2 1 D