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PowerConnect B-Series FCX Configuration Guide 741
53-1002266-01
PIM Dense
25
When the Highest IP RPF feature is enabled, the selection of the shortest path back to the source is
based on which Reverse Path Forwarding (RPF) neighbor in the IP routing table has the highest IP
address, if the cost of the routes are the same. For example, in the table above, Gateway
137.80.129.1 will be chosen as the shortest path to the source because it is the RPF neighbor with
the highest IP address.
When choosing the RPF, the router first checks the Multicast Routing Table. If the table is not
available, it chooses an RPF from the IP Routing Table. Multicast route is configured using the ip
mroute command.
To enable the Highest IP RPF feature, enter commands such as the following.
PowerConnect(config)#router pim
PowerConnect(config-pim-router)#highest-ip-rpf
The command immediately enables the Highest IP RPF feature; there is no need to reboot the
device.
Syntax: [no] highest-ip-rpf
Entering the no version of the command disables the feature; the shortest path back to the source
will be based on the first entry in the IP routing table. If some PIM traffic paths were selected based
on the highest IP RPF, these paths are changed immediately to use the first RPF in the routing
table.
Failover time in a multi-path topology
When a port in a multi-path topology fails, and the failed port is the input port of the downstream
router, a new path is re-established within a few seconds, depending on the routing protocol being
used.
No configuration is required for this feature.
Modifying the TTL
The TTL defines the minimum value required in a packet for it to be forwarded out of the interface.
For example, if the TTL for an interface is set at 10, it means that only those packets with a TTL
value of 10 or more will be forwarded. Likewise, if an interface is configured with a TTL Threshold
value of 1, all packets received on that interface will be forwarded. Possible TTL values are 1 to 31.
The default TTL value is 1.
Total number of IP routes: 19
B:BGP D:Connected R:RIP S:Static O:OSPF *:Candidate default
Destination NetMask Gateway Port Cost Type
..
9 172.17.41.4 255.255.255.252*137.80.127.3 v11 2 O
172.17.41.4 255.255.255.252 137.80.126.3 v10 2 O
172.17.41.4 255.255.255.252 137.80.129.1 v13 2 O
172.17.41.4 255.255.255.252 137.80.128.3 v12 2 O
10 172.17.41.8 255.255.255.252 0.0.0.0 1/2 1 D