HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 779

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Troubleshooting Routing
N o t e
Typically, you should use soft resets because hard resets can disrupt the
network.
A hard reset terminates the TCP connection to the neighbor, causing all routes
to flap. If you enter only the identifier for the neighbor (*, AS number, or IP
address), the router automatically institutes a hard reset. For example, to
initiate a hard reset with all neighbors in AS 1, enter:
ProCurve# clear ip bgp 1
A soft inbound reset simply prompts the neighbor to resend routes, and a soft
outbound reset causes the router to resend routes to the neighbor.
You specify a soft inbound reset with the in keyword and a soft outbound reset
with the out keyword. For example, you can configure a soft outbound reset
and have the router resend routes to all neighbors:
ProCurve# clear ip bgp * out
You can set a soft inbound and outbound reset at the same time with the soft
keyword. For example:
ProCurve# clear ip bgp 1 soft
Removing Filters. IBGP allows you to configure policies to filter the routes
that router accepts from and advertises to neighbors. You configure these
policies in prefix lists and route maps. Because the policies can be quite
complicated, they open room for errors.
One of the first steps that you can take when troubleshooting BGP is to remove
any inbound or outbound filters from the neighbor. If the router begins to
receive or advertise the routes that it should, then you know that the filters
are causing the problem. You can troubleshoot the filters and reapply them.
(See "Troubleshooting a Prefix List" on page 13-170 and "Troubleshooting a
Route Map" on page 13-171.)
To remove filters, move to the BGP neighbor configuration mode context. If
you have applied a prefix list to the neighbor, enter:
Syntax: no prefix-list <listname> [in | out]
If you have applied a route map to the neighbor, remove the map:
Syntax: no route-map <mapname> [in | out]
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