Information Technology Reference
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Corporate HQ
WAN
Figure 7-9
Medium Branch Design
Large Branch Design
The large branch design is the largest of the branch profiles, supporting between 100 and
1000 users. This design profile is similar to the medium branch design in that it also pro-
vides dual access routers in the WAN edge. In addition, dual Adaptive Security Appli-
ances (ASA) are used for stateful firewall filtering, and dual distribution switches provide
the multilayer switching component. The WAN services use an MPLS deployment model
with dual WAN links into the WAN cloud.
Key
To p i c
Because there are dual routers, redundant network routing can be achieved through
EIGRP load balancing. On the distribution layer switches, first-hop redundancy protocols
such as HSRP/GLBP can be used to provide gateway redundancy. The dual ASA configu-
ration allows for redundancy and stateful failover. QoS services such as shaping and polic-
ing can be applied to all the routers and switches as required.
To m e e t t h e r e q u i r e m e n t s o f t h e l a r g e r u s e r b a s e , a d i s t r i b u t i o n l a y e r o f m u l t i l a y e r
switches is added to aggregate the connected access switches. A multilayer switch pro-
vides the additional LAN switching capabilities to meet the port density requirements and
allowing flexibility to support additional network devices.
 
 
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