From: Sawal, Vijay (Vijay.Sawal@xxxxxxxxx)
Date: Wed Jul 26 2000 - 02:10:29 GMT-3
Proposed Acme and International (FRS) Network Integration
Requirement
Two companies called Acme (In country) and International are connected via a
Frame Relay cloud provided a Service Provider called FRS. The Acme network
connects the International Network at two points through the FRS cloud.
Following is some background and solution proposed to have effective
redundancy between the Acme and the International network. Can u validate
the Design and/or suggest the better solution? That will be a great help!
Background
The Frame Relay Provider FRS has a managed routers at location A and
Location B with Frame Relay links of 512 K CIR and 128 K CIR each. These
Routers are kept at Acme Site (two different location) to provide FR
connectivity between Acme and International. The two routers are also
connected to each other by 2 MB leased line. The FRS network for
International Company runs OSPF as a Routing protocol. The in country Acme
Network also runs OSPF. The two OSPF domains DO NOT EXCHANGE routing
information between themselves. Currently all Acme net users access servers
in the International Intranet, through static routes defined in both the FRS
managed routers and 'Valley' at Location A and Cisco-3640 at Location B.
The preferred route to reach any of the International sites is the 512 K CIR
FR PVC from Location A.
At Location A, 'Valley' (Cisco 3660) is connected to Internet through
FireWall. It is possible to reach some of the International sites (otherwise
accessible through FRS Network), through Internet VPN from Location A.
'Valley' has static routes to some International sites through the FireWall
(and Internet) and to some other International sites through the FRS managed
router.
<<...OLE_Obj...>>
Proposed Solution
To avoid the static route configuration and management, it is proposed that
between the FRS managed routers and the Acme-Net routers (Cisco 7206) at
Location A and Location B , RIP 2 will be used. The International network
routes will be redistributed into RIP 2 segment between the FRS managed
Router and the Acme Router and then the RIP 2 will be redistributed into
Acme-Net OSPF network routers at Location A and B. The RIP 2 routes will be
redistributed into Acme OSPF with a higher metric at Location A than
Location B, since the route from Location A should be preferred over routes
from location B for traffic between Acme and International when both links
are up.
The Cisco 7206 at location will redistribute only those RIP 2 routes into
Acme network that need not be accessed through the Internet to reach the
International Network.
The router at Location A will have a default route to 'Valley'.
Scenario 1: All Links Up
All Acme-Net users will learn the International Network sites through the
Cisco 7206 at Location A and route data through the 512 K FR PVC. Sites that
need to be accessed via Internet will continue to be accessed via Internet.
Scenario 2: The 512 K CIR PVC from Location is down
All routers on Acme-net will learn the International Sites through Location
B and route data through the 128 K CIR PVC to International.
Scenario 3: The 512 K CIR PVC between Location A and FRS Router and the 2 MB
Link between Location A FRS Router and Location B FRS Router is down
All routers on Acme-Net will learn the International Sites through Location
A and route data through the 128 K CIR PVC to International via the FRS FR
cloud.
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