Nortel Networks NN43001-563 Active Leader and Backup Leader interaction, Active Leader/Backup Leader and DCHIP card interaction

IP trunk card description 45

Active Leader and Backup Leader interaction

When a Leader card reboots into service, it sends bootp requests to

check whether an Active Leader card is present. If it receives a bootp

response, this indicates the presence of an Active Leader card and the

rebooting Leader becomes the BackupLeader. If it does not receivea bootp

response, this indicates the absence of an Active Leader andthe rebooting

Leader becomes the Active Leader.

The Backup Leader monitors the heartbeat of the Active Leader by pinging

the Active Leader’s Node IP.In the event of the Active Leader’s failure (that

is, the ActiveLeader is not responding to the pinging of the Node IP address

by the Backup Leader), the Backup Leader takes overthe Active Leader

role, in order to avoid service interruption. The Backup Leader assigns

the Node IP to its voice interfaceand announces its new status to all the

Follower cards. The Followers re-register with the new Active Leader and,

as a result, a new Resource Tableis built immediately.

The Leader 0 and Leader 1 cards keep their node properties synchronized.

The Backup Leader receives a copy of the bootp.1 ﬁle,containing the bootp

table, from the Active Leader on bootup and when Node Properties are

downloaded to the Active Leader.

Critical synchronized data includes the following:

•the card index:

— index 1 indicates Leader 0

— index 2 indicates Leader 1

— index 3 or greater indicates Follower

•the Management MAC address (motherboard Ethernet address)

•the Node IP address

•the individual card IP addresses and card TNs for all IP trunk cards in

the IP Trunk3.01 (and later) node

•D-Channel number, card density and First CHID

In the event of a Backup Leader failure,the Leader card generates an

SNMP trap to the TM 3.1 management station, indicating this failure.

If the Active Leader and BackupLeader are reset, removed,or disconnected

from the LAN at the same time, the entire IP Trunk3.01 (and later) node is

put out-of-service. If this situation occurs, manual intervention is required to

recover the system.

Active Leader/Backup Leader and DCHIP card interaction

The Active Leader checks the status of the DCHIP card. The DCHIP card

must constantly inform the Leader of its DCH status and its card status.

Nortel Communication Server 1000

IP TrunkFundamentals

NN43001-563 02.01 Standard

Release 5.5 21December 2007