BGP Conditional Adv Tab
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BGP Conditional Adv Tab
- Network > Virtual Router > BGP > Conditional Adv
A BGP conditional advertisement allows you to control which route
to advertise in the event that a preferred route is not available
in the local BGP routing table (LocRIB), indicating a peering or
reachability failure. This is useful where you want to try to force
routes to one AS over another, such as when you have links to the
internet through multiple ISPs and you want traffic to be routed
to one provider instead of the other except when there is a loss
of connectivity to the preferred provider.
For conditional advertisement, you configure a Non Exist filter
that specifies the preferred route(s) (Address Prefix)
plus any other attributes that identify the preferred route (such
as AS Path Regular Expression). If a route matching the Non Exist
filter is not found in the local BGP routing table, only then will
the firewall allow advertisement of the alternate route (the route
to the other, non-preferred provider) as specified in its Advertise
filter.
To configure conditional advertisement, select the Conditional
Adv tab, Add a conditional advertisement,
and configure the values described in the following table.
BGP Conditional Advertisement Settings | Configure In | Description |
---|---|---|
Policy | BGPConditional Adv | Specify a name for this conditional advertisement
policy rule. |
Enable | Select to enable this conditional advertisement
policy rule. | |
Used By | Add the peer groups
that will use this conditional advertisement policy rule. | |
Non Exist Filter | BGPConditional AdvNon Exist Filters | Use this tab to specify the prefix(es) of
the preferred route. This specifies the route that you want to advertise,
if it is available in the local BGP routing table. (If a prefix
is going to be advertised and matches a Non Exist filter, the advertisement
will be suppressed.) Add a Non Exist
Filter and specify a name to identify this filter. |
Enable | Select to activate the Non Exist filter. | |
AS Path Regular Expression | Specify a regular expression for filtering
AS paths. | |
Community Regular Expression | Specify a regular expression for filtering
community strings. | |
Extended Community Regular Expression | Specify a regular expression for filtering
extended community strings. | |
MED | Specify a MED value for route filtering
(range is 0-4,294,967,295). | |
Route Table | Specify which route table (unicast, multicast,
or both) the firewall will search to see
if the matched route is present. If the matched route is not present
in that route table, only then will the firewall allow the advertisement of
the alternate route. | |
Address Prefix | Add the exact Network
Layer Reachability Information (NLRI) prefix for the preferred route(s). | |
Next Hop | Specify next hop routers or subnets for
filtering the route. | |
From Peer | Specify peer routers for route filtering. | |
Advertise Filter | BGPConditional AdvAdvertise Filters | Use this tab to specify the prefix(es) of
the route in the Local-RIB routing table to advertise if the route
in the Non Exist filter is not available in the local routing table. If
a prefix is to be advertised and does not match a Non Exist filter,
the advertisement will occur. Add an
advertise filter and specify a name to identify this filter. |
Enable | Select to activate the filter. | |
AS Path Regular Expression | Specify a regular expression for filtering
AS paths. | |
Community Regular Expression | Specify a regular expression for filtering
community strings. | |
Extended Community Regular Expression | Specify a regular expression for filtering
extended community strings. | |
MED | Specify a MED value for route filtering
(range is 0-4,294,967,295). | |
Route Table | Specify which route table the firewall uses
when a matched route is to be conditionally advertised: unicast, multicast,
or both. | |
Address Prefix | Add the exact Network
Layer Reachability Information (NLRI) prefix for the route to be
advertised if the preferred route is not available. | |
Next Hop | Specify next hop routers or subnets for
route filtering. | |
From Peer | Specify peer routers for route filtering. |