Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario descargar pdf (Pagina 53)

Configuring and Customizing IP for BGP

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4-9

Defining a Static Route

A static route is a manually configured route that specifies the transmission path a

datagram must follow, based on the datagram’s destination address. A static route

specifies a transmission path to another network. You configure a static route if

you want to restrict datagrams to paths you specifically configure.

Static routes remain in IP routing tables until you remove them. Note, however,

that if the interface that was used to reach the next hop in the static route becomes

disabled, the static route disappears from the IP routing table.

You can use the BCC or Site Manager to specify the following:

• The state (active or inactive) of the static route record in the IP routing tables.

• The IP address of the network to which you want to configure the static route.

• The subnet mask of the destination network.

• The number of router hops a datagram can traverse before reaching the

destination IP address. The IP router uses the cost value when determining the

best route for a datagram to follow.

• The IP address of the next-hop router.

• The subnet mask of the next-hop router.

• A weighted value (from 1 to 16, with 16 being the most preferred) that the IP

router uses to choose a route when its routing tables contain multiple routes to

the same destination.

• The local router circuit associated with the static route over an unnumbered

interface.

IP supports multiple static routes to the same destination. IP uses the best route to

forward packets, and treats the other routes as backup routes in case the chosen

route becomes unusable or is no longer considered the best route.

You can also configure IP to support equal-cost multipath (ECMP) routes for

traffic load balancing. If IP considers the ECMP routes to be the best routes, IP

uses them all in the way you specify -- in round-robin fashion, for example -- to

forward data. For information, see “

Enabling Equal-Cost Multipath Support” on

page 4-5. With ECMP enabled globally on the router, you can configure up to 12

ECMP static routes.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario Pagina 53