Dell FCX624-I Laptop User Manual


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PowerConnect B-Series FCX Configuration Guide 1093
53-1002266-01
Updating route information and resetting a neighbor session
30
Syntax: show ip bgp neighbors <ip-addr> received-routes [detail]
The detail parameter displays detailed information for the routes. The example above shows
summary information.
NOTE
The syntax for displaying received routes is shown. For complete command syntax, refer to
“Displaying BGP4 neighbor information” on page 1067.
NOTE
The show ip bgp neighbors <ip-addr> received-routes syntax supported in previous software
releases is changed to the following syntax: show ip bgp neighbors <ip-addr> routes.
Dynamically requesting a route refresh from
a BGP4 neighbor
You can easily apply changes to filters that control BGP4 routes received from or advertised to a
neighbor, without resetting the BGP4 session between the Layer 3 Switch and the neighbor. For
example, if you add, change, or remove a BGP4 address filter that denies specific routes received
from a neighbor, you can apply the filter change by requesting a route refresh from the neighbor. If
the neighbor also supports dynamic route refreshes, the neighbor resends its Adj-RIB-Out, its table
of BGP4 routes. Using the route refresh feature, you do not need to reset the session with the
neighbor.
The route refresh feature is based on the following specifications:
RFC 2842. This RFC specifies the Capability Advertisement, which a BGP4 router uses to
dynamically negotiate a capability with a neighbor.
RFC 2858 for Multi-protocol Extension.
NOTE
The Dell implementation of dynamic route refresh supports negotiation of IP version 4 unicasts
only.
RFC 2918, which describes the dynamic route refresh capability
The dynamic route refresh capability is enabled by default and cannot be disabled. When the Layer
3 Switch sends a BGP4 OPEN message to a neighbor, the Layer 3 Switch includes a Capability
Advertisement to inform the neighbor that the Layer 3 Switch supports dynamic route refresh.
PowerConnect#show ip bgp neighbors 192.168.4.106 received-routes
There are 97345 received routes from neighbor 192.168.4.106
Searching for matching routes, use ^C to quit...
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH S:SUPPRESSED F:FILTERED
Prefix Next Hop Metric LocPrf Weight Status
1 3.0.0.0/8 192.168.4.106 100 0 BE
AS_PATH: 65001 4355 701 80
2 4.0.0.0/8 192.168.4.106 100 0 BE
AS_PATH: 65001 4355 1
3 4.60.212.0/22 192.168.4.106 100 0 BE
AS_PATH: 65001 4355 701 1 189
4 6.0.0.0/8 192.168.4.106 100 0 BE