
Configuring IP Exterior Gateway Protocols (BGP and EGP)
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Using Site Manager
To disable or reenable route aggregation, complete the following steps:
Enabling and Disabling Black Hole Punching
If BGP advertises aggregate routes, you can configure BGP to submit each
aggregate route to the routing table as a
black hole
.
This setting forces the router
to drop a packet whose longest matching destination prefix is the black hole route.
(For more information about black hole routes, see
Configuring IP, ARP, RARP,
RIP, and OSPF Services
.)
By default, BGP does not submit a black hole route to the IP routing table for an
aggregate route that it advertises to a BGP peer.
You can use the BCC or Site Manager to enable black hole punching. You can also
configure IP to return an ICMP destination unreachable message to the sender of a
packet that best matches the black hole route.
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose
Protocols
.
The Protocols menu opens.
2. Choose
IP
. The IP menu opens.
3. Choose
BGP
. The BGP menu opens.
4. Choose
BGP Global
. The Edit BGP Global Parameters window
opens.
5. Set the
Aggregate Subnets
parameter.
Click on
Help
or see the parameter
description on page A-8
.
6. Click on
OK
. You return to the Configuration Manager
window.
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