background image
DLSw+ Design Topologies 525
Figure 14-13
Border Peers
Design Rules
The following rules should be applied in any DLSw+ design situation that calls for multiple
active border peers:
·
All border peers in a group must peer to each other.
·
Try to have multiple active border peers for redundancy, not load balancing. Border peers
do not provide for load balancing.
·
Within a group, every group member must peer to every border peer in its group.
·
Border peer routers should be in the 7200 or 7500 series to support the large amount of
broadcast and explorer traffic.
·
Try to position border peers at distribution or central sites. The sole function of a border
peer is to replicate the broadcast of branch routers. Because these routers are at the heart
of the DLSw+ network and must handle many broadcasts, they should be the more
powerful routers and should be located at regional or central sites.
Router A
Flood
Router B
Flood
Router C
Flood
Router D
Flood
Router E
CANUREACH
Border peer A
Flood
Border peer B
Router F
Router G
Router H
Router J
1. Check local cache
2. Check remote cache
3. Check group cache
4. Flood to other group
members and border peers
87200333.book Page 525 Wednesday, August 22, 2001 1:41 PM