Avaya Configuring IP Services Manual do Utilizador Página 86

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Configuring IP Services
3-22 114065 Rev. A
Enabling Source Routing over a Token Ring Network
The IP router can route over Token Ring (TR) networks that contain one or more
source-routing bridges.
In a source-routing network, every endstation that sends out a frame supplies the
frame with the necessary route descriptors so that it can be source routed across
the network. Thus, in order for IP routers to route packets across a source-routing
network, they must act like endstations, supplying route descriptors for each
packet before they send it out onto the network.
With endnode support enabled, whenever an IP router receives a packet and
determines that the packet’s next hop is located across a source-routing network,
the router
Adds the necessary Routing Information Field (RIF) information to the
packet’s MAC header
Sends the packet out onto the network where it is source routed toward the
next hop
Upon receiving the packet from the Token Ring network, the peer router strips off
the RIF and continues to route the packet toward the destination network address
(Figure 3-3).
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