Avaya Configuring Bridging Services Manual do Utilizador Página 69

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Using Source Routing Bridge Services
114060 Rev. A 2-9
Source Route Endstation Support
The Bay Networks routers running IP, IPX, XNS, AppleTalk, and VINES
protocols support support routing over Token Ring networks that contain one or
more source routing bridges. This feature is called source route endstation
support.
In a source routing network, every endstation that sends out a frame supplies the
frame with the necessary route descriptors so that the router can source route it
across the network. Thus, for routers to route packets across a source routing
network, they must act like endstations; the routers must supply route descriptors
for each packet before they send it out onto the network.
When you enable end-node support and a Bay Networks router running IP, IPX,
XNS, AppleTalk, or VINES receives a packet and determines that the packet’s
next hop is across a source routing network, the router performs these steps:
1. Adds the necessary RIF information to the packet’s MAC header
2. Sends the packet out onto the network where it is source routed toward
the next hop
When the peer router receives the packet from the Token Ring network, it strips
off the RIF field and continues to route the packet toward the destination network
address (refer to Figure
2-6).
You configure source route end-node support for each individual routing protocol
on a per-circuit basis.
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