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Configuring Differentiated Services

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308620-14.00 Rev 00

URL Filters

The router can filter and mark Hypertext Transfer Protocol (HTTP) traffic based

on uniform resource locator (URL) strings. For the router to use an URL filter,

whether it is installed by the bandwidth broker or configured manually, it must

contain the URL string and optionally, any of the following information:

• Source IP address

• Destination IP address

• Destination port (the default port is 80)

Although only the URL string is required, for efficient data transmission, it is

useful to also include one of these other filter criteria.

After the trigger and flow filters are configured on the router, the router can mark

inbound HTTP traffic for transmission through the network. If the router receives

data that matches a URL filter, the router installs another filter, called the dynamic

filter, on the next-hop interface, which is an interface on this same router. This

filter is available for the duration of the HTTP session. This dynamic filter is

deleted if there is no data activity during the time period specified by the URL idle

out timer. The original URL filter remains installed on the router.

For more information about the URL idle out timer, see the URL Idle Out Timer

parameter description on page A-4.

You must configure differentiated services on all possible next-hop interfaces on

the router, or at least all next-hop interfaces where the HTTP servers might reside.

Otherwise, the router will not be able to mark the return packets.

Note:

Even if you configure URL filters manually (static configuration), the

differentiated services application uses COPS to install the dynamic filter.

URL filters are the only filters that create these dynamic filters.

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Avaya Configuring Differentiated Services Manual de usuario Pagina 26