
Configuring IP Services
4-46 117356-A 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 end station that sends 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 end stations, supplying route descriptors for each
packet before they send it onto the network.
With end-node 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 onto the network where it is source routed toward the next
hop
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