
Configuring and Customizing IP
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With end-station support enabled, an IP router does the following (Figure 3-2):
1. Receives a packet and determines that the packet’s next hop is located across a
source routing network
2. Adds the necessary routing information field (RIF) information to the packet’s
MAC header
3. Sends the packet 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 3-2. IP Routers Source Routing Across a Token Ring Network
The router can send ARP packets over an interface configured for a token ring
network. Nortel Networks supports both spanning tree explorer (STE) and all
routes explorer (ARE) ARP packets.
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 BBridge A
Router 2
Router 1
WF2 WF1 SNAP IP DATA
WF2 WF1
WF2 WF1
DATA
DATA
SNAP
IP
SNAP
IP
Token
ring
Token
ring
Token
ring
IP0012A
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