
Configuring IP Services
3-12 114065 Rev. A
Enabling ISP Mode on the Router
IP provides certain features designed for use by internet service providers (ISPs).
This set of features optimizes the router forwarding performance in a core Internet
backbone application and includes a BGP soloist.
By default ISP mode features are disabled on the router. You can use Site Manager
to enable the following features:
• Suppression of IP forwarding tables. By default, IP maintains a forwarding
table on each IP interface. IP maintains this table as a cache for routes that are
frequently used to forward data packets that arrive on the interface. However,
if the number of frequently-used routes exceeds the size of the forwarding
table, the router will be continually updating the forwarding table by
removing old routes and installing new route entries. ISP mode disables all
forwarding tables on all interfaces and optimizes the routing table to allow
direct forwarding, avoiding the overhead of cache misses and cache updates.
If you select ISP mode, you do not have to explicitly disable the forwarding
tables on each interface.
• BGP soloist. By default, BGP runs on all slots configured with IP interfaces.
In ISP mode, BGP runs as a soloist. (For further information see “Configuring
BGP as a Soloist” on page 6-13.)
The following parameter settings also help optimize the router’s performance and
operation:
Site Manager: ISP Mode parameter: page A-45
IP Global Parameter Setting
Route Filter Support Disabled
Maximum Policy Rules Set ss required
Estimated Networks Set as required
ICMP Redirects Set to off at router interconnection points
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