Technical data

Switching and Routing

Filters apply only to new connections. New filters do not affect existing connections.

You can turn off web caching for a certain range of source or destination addresses to allow filtering on an address

basis using IP filters.

Policy-Based Cache Switching

The ServerIron TCS software allows you to configure IP filters to selectively cache or not cache content from

specific web sites on specific cache servers. For example, suppose some of your cache servers come

preconfigured with specific web pages and you want all updates to those pages to go only to the preconfigured

caches. In this case, you can use policy-based cache switching along with IP filters to configure the ServerIron to

send the content only to the specified cache servers.

You also can configure IP filters to prevent specific web sites from being cached on specific cache servers or all

cache servers.

See “Policy-Based Caching” on page 15-37 for more information about this feature.

Setting the TTL

To set the maximum time that a packet will live on the network, enter the following command:

ServerIron(config)#ip ttl 25

Syntax: [no] ip ttl <hops>

<hops> is from 1 to 255. The default is 64.

Configuring an IP Protocol VLAN

When creating an IP protocol VLAN on a switch, all ports are dynamically assigned to the VLAN.

On a router, no ports are dynamically assigned to an IP protocol VLAN. VLAN port membership must be assigned

using the static command, as shown in the example below. Because no dynamic port assignment is made for IP

Protocol VLANs on a router, there is no need to exclude any ports, only specify membership with the static

command.

An IP protocol and IP sub-net VLAN cannot operate simultaneously on a Brocade switch or router. This restriction

is also true for IPX and IPX network VLANs. If you have previously defined an IP sub-net VLAN on the system,

you need to delete it before an IP protocol VLAN can be created.

To assign ports 1, 2, 6 and 8 to an IP protocol VLAN, enter the following commands:

ServerIron(config)#ip-proto

ServerIron(config-ip-proto)#static e1 to 2 e6 e8

Syntax: [no] ip-proto

Configuring an IP Subnet Protocol VLAN

An IP sub-net protocol VLAN on a switch or router allows you to provide additional granularity than that of an IP

protocol VLAN, by allowing broadcast domains to be partitioned by sub-net. As with the IP protocol VLAN, port

membership can be modified using the static commands. In creating an IP sub-net VLAN, an IP address is used

as an identifier.

When creating an IP sub-net VLAN on a switch, all ports are dynamically assigned to the VLAN.

On a router, no ports are dynamically assigned to an IP sub-net VLAN. VLAN port membership must be assigned

using the static command, as shown in the example below. Because no dynamic port assignment is made for IP

sub-net VLANs on a router, there is no need to exclude any ports, only specify membership with the static

command.