Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 620)

592 Multi-Service IronWare Routing Configuration Guide
53-1003033-02
Configuring BGP4+ graceful restart
Configuring BGP4
+
graceful restart
BGP4+ Graceful Restart (GR) can be configured for a global routing instance or for a specified
Virtual Routing and Forwarding (VRF) instance. The following sections describe how to enable the
BGP4+ Graceful Restart feature.
NOTE
Graceful restart is not supported for multicast. Only IPv4 and IPv6 are supported.
BGP4+ Graceful Restart is fully supported by Brocade MLX series and Brocade NetIron XMR
devices. The Brocade NetIron CER and Brocade NetIron CES devices only support helper mode.
State The state of the session with the neighbor. The states are from the
perspective of this device of the session, not the perspective of the
neighbor. The state values are based on the BGP4 state machine values
described in RFC 1771 and can be one of the following for each device:
•
IDLE – The BGP4 process is waiting to be started. Usually, enabling
BGP4 or establishing a neighbor session starts the BGP4 process.
•
A minus sign (-) indicates that the session has gone down and the
software is clearing or removing routes.
•
ADMND – The neighbor has been administratively shut down.
•
A minus sign (-) indicates that the session has gone down and the
software is clearing or removing routes.
•
CONNECT – BGP4 is waiting for the connection process for the TCP
neighbor session to be completed.
•
ACTIVE – BGP4 is waiting for a TCP connection from the neighbor.
NOTE: When the state frequently changes between CONNECT and
ACTIVE, there may be a problem with the TCP connection.
•
OPEN SENT – BGP4 is waiting for an Open message from the
neighbor.
•
OPEN CONFIRM – BGP4 has received an OPEN message from the
neighbor and is now waiting for either a KEEPALIVE or
NOTIFICATION message. When the device receives a KEEPALIVE
message from the neighbor, the state changes to Established.
When the message is a NOTIFICATION, the state changes to Idle.
•
ESTABLISHED – BGP4 is ready to exchange UPDATE messages
with the neighbor.
•
When there is more BGP data in the TCP receiver queue, a plus
sign (+) is also displayed.
Time The time that has passed since the state last changed.
Accepted The number of routes received from the neighbor that this device
installed in the BGP4 route table. Usually, this number is lower than the
RoutesRcvd number. The difference indicates that this device filtered
out some of the routes received in the UPDATE messages.
Filtered The routes or prefixes that have been filtered out.
Sent The number of BGP4 routes the device has sent to the neighbor.
ToSend The number of routes the device has queued to advertise and withdraw
to a neighbor.
TABLE 128 BGP4+ VRF6 nexthop information (Continued)
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