IBM T.J. Watson Resaerch Center

Route Server Design

Yakov Rekhter

IBM T.J. Watson Research Center

Table of Contents

Inbound Advertisements -- Router Model

Inbound and Outbound Advertisements -- Router Model

Inbound Advertisements -- Route Server Model

Inbound and Outbound Advertisements -- Router Server Model

Identification of Views

A view may include one or more neighboring AS

Configuration example:
peeras as ofview view
where as is the AS number of the peer
Export policies on a per view basis
view is a number identifying the view associated with AS
Import policies on a per view basis
Route selection criteria on a per view basis

Protocol Behavior

AS number insertion configurable (on a per peer basis)
Multi-Exit Discriminator (MED) is passed unmodified
NEXT_HOP attribute is not restricted to a subnet common with RS

Acknowledgements

Based on work done by the ISI/IBM and MERIT teams for the Routing Arbiter project.
Funded by the National Science Foundation (NSF).

For More Information:

URL = ftp://ftp.isi.edu/pub/hpcc-pa pers/ra

Stan Barber's Notes

Router model involves incoming routes into a information base influenced by an import policy. This information base provides data from which a forwarding table is derived. The information base can also be used to advertise routes after applying and advertising policy to other routers. The route server provides multiple views (which includes import and export policies) on an AS basis. It must be at least one AS per view (but a view can also include multiple ASes).

The route server can insert an AS for the route server if it is configured to do so. The MED is not changed. NEXT_HOP attribute is not restricted to a subnet common with RS.

The RS is going go add the mechanism Curtis discussed previously. Currently, the RA peering is working at MAE-EAST in a pre-production mode.

More information is available at ftp://ftp.isi.edu/pub/hpcc-papers/ra

Copyright © 1995 Stan Barber. Reproduction with attribution granted.
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