Configuration Guide User guide

1586 FastIron Configuration Guide
53-1002494-02
DVMRP configuration on the Layer 3 switch and interface
Modifying DVMRP interface parameters
DVMRP global parameters come with preset values. The defaults work well in most networks, but
you can modify the following interface parameters if you need to:
• TTL
• Metric
• Advertising
Modifying the TTL
The time to live (TTL) value defines the minimum value required in a packet in order for the packet
to be forwarded out 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 are forwarded. Likewise, if an interface is
configured with a TTL Threshold value of 1, all packets received on that interface are forwarded.
Possible values are from 1 – 64. The default value is 1.
To set a TTL of 64, enter the following commands.
Brocade(config)#int e 1/4
Brocade(config-if-1/4)#ip dvmrp ttl 60
Syntax: ttl-threshold <1-64>
Modifying the metric
The router uses the metric when establishing reverse paths to some networks on directly attached
interfaces. Possible values are from 1 – 31 hops. The default is 1.
NOTE
This command is not supported on Brocade Layer 2 Switches.
To set a metric of 15 for a DVMRP interface, enter the following commands.
Brocade(config)#interface 3/5
Brocade(config-if-3/5)#ip dvmrp metric 15
Syntax: ip dvmrp metric <1-31>
Enabling advertising
You can turn the advertisement of a local route on (enable) or off (disable) on the interface. By
default, advertising is enabled.
To enable advertising on an interface, enter the following commands.
Brocade(config-if-1/4)#ip dvmrp advertise-local on
Syntax: advertise-local on | off