Frame Relay IP Routing
Page 29-16
An InARP message is sent between the two routers indicating their IP addresses and associ-
ated VC. Once they know each other’s IP address and the
DLCI
of the VC on each end of the
link (the same VC may have a different
DLCIs
on each end), then they can begin normal rout-
ing of RIP frames, etc.
The Frame Relay Subnet and “Split Horizon”
The IP protocol must account for the Frame Relay network in making routing decisions. After
all, the
WAN
network is more than just a single cable, or even several cables, attaching two
routers. The solution is to assign the Frame Relay network a unique IP subnet.
Frame Relay Network Is an IP SubNet
In the configuration shown above, one virtual circuit connects the
WSX
router on IP Subnet
1.1.1.x and the other router on IP Subnet 3.3.3.x. The Frame Relay network, for routing
purposes, is considered to be IP Subnet 2.2.2.x. Routing decisions are straightforward in this
setup. But if another Router and another IP Subnet were added, a special routing technique
must be devised.
R
WSX
Subnet 1.1.1.X
Subnet 3.3.3.X
Subnet 2.2.2.X
Frame Relay network consid-
ered a unique IP Subnet by IP.
Virtual circuit connects
two
WAN
Routers.
Summary of Contents for Omni Switch/Router
Page 1: ...Part No 060166 10 Rev C March 2005 Omni Switch Router User Manual Release 4 5 www alcatel com ...
Page 4: ...page iv ...
Page 110: ...WAN Modules Page 3 40 ...
Page 156: ...UI Table Filtering Using Search and Filter Commands Page 4 46 ...
Page 164: ...Using ZMODEM Page 5 8 ...
Page 186: ...Displaying and Setting the Swap State Page 6 22 ...
Page 202: ...Creating a New File System Page 7 16 ...
Page 270: ...Displaying Secure Access Entries in the MPM Log Page 10 14 ...
Page 430: ...OmniChannel Page 15 16 ...
Page 496: ...Configuring Source Route to Transparent Bridging Page 17 48 ...
Page 542: ...Dissimilar LAN Switching Capabilities Page 18 46 ...
Page 646: ...Application Example DHCP Policies Page 20 30 ...
Page 660: ...GMAP Page 21 14 ...
Page 710: ...Viewing the Virtual Interface of Multicast VLANs Page 23 16 ...
Page 722: ...Application Example 5 Page 24 12 ...
Page 788: ...Viewing UDP Relay Statistics Page 26 24 ...
Page 872: ...The WAN Port Software Menu Page 28 46 ...
Page 960: ...Deleting a PPP Entity Page 30 22 ...
Page 978: ...Displaying Link Status Page 31 18 ...
Page 988: ...Displaying ISDN Configuration Entry Status Page 32 10 ...
Page 1024: ...Backup Services Commands Page 34 14 ...
Page 1062: ...Diagnostic Test Cable Schematics Page 36 24 ...
Page 1072: ...Configuring a Switch with an MPX Page A 10 ...
Page 1086: ...Page B 14 ...
Page 1100: ...Page I 14 Index ...