Failover Time In A Multi-Path Topology; Modifying The Ttl; Pim Sparse - Dell PowerConnect B-RX Configuration Manual

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Failover time in a multi-path topology

Previously, when a port in a multi-path topology fails, multicast routers, 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 router.
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 64.
The default TTL value is 1.
To configure a TTL of 45, enter the following.
BigIron RX(config-if-e10000-3/24)# ip pim ttl 45
Syntax: ip pim ttl <1-64>

PIM Sparse

The BigIron RX supports Protocol Independent Multicast (PIM) Sparse version 2. PIM Sparse
provides multicasting that is especially suitable for widely distributed multicast environments. The
Brocade implementation is based on RFC 2362.
In a PIM Sparse network, a PIM Sparse router that is connected to a host that wants to receive
information for a multicast group must explicitly send a join request on behalf of the receiver (host).
PIM Sparse routers are organized into domains. A PIM Sparse domain is a contiguous set of routers
that all implement PIM and are configured to operate within a common boundary.
shows a simple example of a PIM Sparse domain. This example shows three BigIron RX devices
configured as PIM Sparse routers. The configuration is described in detail following the figure.
BigIron RX Series Configuration Guide
53-1002253-01
Total number of IP routes: 19
B:BGP D:Connected R:RIP
Destination
..
9 172.17.41.4
172.17.41.4
172.17.41.4
172.17.41.4
10 172.17.41.8
S:Static O:OSPF *:Candidate default
NetMask Gateway
255.255.255.252*137.80.127.3
255.255.255.252 137.80.126.3
255.255.255.252 137.80.129.1
255.255.255.252 137.80.128.3
255.255.255.252 0.0.0.0
23
PIM Sparse
Port Cost
v11 2
v10 2
v13 2
v12 2
1/2 1
Figure 92
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