Displaying the EGP Group Neighbor Table Detail Window 12-5

Viewing EGP Group Information
Hello
The interval between EGP Hello command retransmissions (in hundredths of a
second), according to egpNeighIntervalHello. This represents the t1 timer as defined
in RFC 904. The t1 timer controls Request (initiate communications with a
neighbor), Hello (periodic reachability updates), and Cease (sever
communications with a neighbor) transmissions.
Poll
The interval between EGP poll command retransmissions (in hundredths of a
second), according to egpNeighIntervalPoll. This represents the t3 timer as defined
in RFC 904. The t3 timer is an abort timer. It runs during all states except Idle. If
the t3 timer reaches 0, a Stop event is declared and the EGP entity returns to the
Idle state.
Mode
The polling mode of this EGP entity, according to egpNeighMode, either passive or
active. Mode indicates the Hello Polling Mode. In the Active mode, the device
acquires reachability information by transmitting Hello and Poll commands to
neighbors. In the Passive mode, the device doesn’t transmit; it reads the status
field of received Poll or Hello commands or Update responses.
Event Trigger
A control variable used to trigger operator-initiated Start and Stop events,
according to egpNeighEventTrigger. When read, this variable always returns the
most recent value that egpNeighEventTrigger was set to. If it has not been set
since the last initialization of the network management subsystem on the node, it
returns a value of ‘stop’. When set, this variable causes a Start or Stop event on the
specified neighbor, as specified on pages 8-10 of RFC 904. Briefly, a Start event
causes an Idle peer to begin neighbor acquisition and a non-Idle peer to reinitiate
neighbor acquisition. A stop event causes a non-Idle peer to return to the Idle
state until a Start event occurs, either via egpNeighEventTrigger or otherwise.
Setting the Event Trigger
The Event Trigger can start or stop communication with an EGP Neighbor. For
example, if you have primary and secondary connections to an autonomous
system, you could stop the process to one device and start the process to the other
device, which would change the path of communications with that neighboring
autonomous system.
To start and stop communication with an EGP Neighbor:
1. In the EGP Group Neighbor Table Detail window, highlight an entry in the
table.
2. Click on the Start/Stop button.
This button always reflects the most recent command received. If this trigger has
not been set since the last initialization of the network management subsystem on
the node, the button will default to Stop.