Cabletron Systems SSIM-R8-02 Specifikace stáhnout pdf (Strana 242)

Configuring DVMRP

222 Enterasys Xpedition User Reference Manual

Configuring the DVMRP Routing Metric

You can configure the DVMRP routing metric associated with a set of destinations for

DVMRP reports. The default metric is 1.

To configure the DVMRP routing metric, enter the following command in Configure

mode:

Configuring DVMRP TTL & Scope

For control over internet traffic, per-interface control is allowed through Scopes and TTL

thresholds.

The TTL value controls whether packets are forwarded from an interface. The following

are conventional guidelines for assigning TTL values to a multicast application and their

corresponding XP setting for DVMRP threshold:

TTL = 1 Threshold = 1 Application restricted to subnet

TTL < 16 Threshold = 16 Application restricted to a site

TTL < 64 Threshold = 64 Application restricted to a region

TTL < 128 Threshold = 128 Application restricted to a continent

TTL = 255 Application not restricted

To configure the TTL Threshold, enter the following command in Configure mode:

TTL thresholding is not always considered useful. There is another approach of a range of

multicast addresses for “administrative” scoping. In other words, such addresses would

be usable within a certain administrative scope, a corporate network, for instance, but

would not be forwarded across the internet. The range from 239.0.0.0 through

239.255.255.255 is being reserved for administratively scoped applications. Any

organization can currently assign this range of addresses and the packets will not be sent

out of the organization. In addition, multiple scopes can be defined on per-interface basis.

Configure the DVMRP routing

metric.

dvmrp set interface <ip-addr> metric <number>

Configure the TTL Threshold. dvmrp set interface <ip-addr> threshold <number>

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Cabletron Systems SSIM-R8-02 Specifikace Strana 242