
Configuring IP Routers and Interfaces
2-13
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 2-5).
Figure 2-5. IP Routers Source Routing across a Token Ring Network
Bridge A
Packet sent from End Station 1
Packet sent from Router 2
Packet sent from Router 1
Source Route RIF
0830 001A002B 0030
End Station 1
End Station 2
Bridge B
Router 2
Router 1
Token
Ring
Token
Ring
Token
Ring
WF2 WF1 SNAP IP DATA
WF2 WF1
WF2 WF1
DATA
DATA
SNAP IP
SNAP IP
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