Lucent Technologies 9077 04S, 9076 Recovery procedure if an SP Switch Router Adapter card fails

Network Configuration Examples

Recovery procedure if an SP Switch Router Adapter card fails

The configuration in Figure C-2 is not redundant because two active SP Switch Router Adapter cards cannot carry the same IP address. Alias addresses cannot be used if more than one of the cards sharing the address are active. An alias address can be shared between two cards if only one card is active. This is shown in Figure C-3.

Multiple logical addresses can be assigned to the single physical interface on one SP Switch Router Adapter card. In a multiple card configuration, the failure of one card is recovered by assigning its logical IP address to another card. This card will then carry the traffic for both, and traffic for the failed card will be routed through the other card’s SP Switch connection. You can verify the new configuration by displaying the new ARP table.

card 198.174.11.1

SP Switch Router

Adapter card 1 - gt010

SP
Switch
Router		card 198.174.11.1
		card 198.174.11.129
			net 198.174.11.128
	SP Switch Router
	Adapter card 2 - gt020		mask 255.255.255.128

1

3

SP Switch 4

5

2

SP processor node

SP processor node

SP processor node

Partition

net 198.174.11.0 mask 255.255.255.0

Switch node number

New ARP table

gt020	(0):	198.174.11.1	=>	0:0:0:0:0:
gt020	(0):	198.174.11.1	=>	0:0:0:0:0:
		•
		•
		•

Figure C-3. Recovery from a card failure in a dually-connected configuration

If the gt010 card fails, the SP system administrator must manually reconfigure the SP Switch Router subnets by logging into the router and performing these steps:

1Remove gt010 from active status using the following ifconfig command:

#ifconfig gt010 delete

2Assign the surviving card, gt020, the alias address:

#ifconfig gt020 198.174.11.1 255.255.255.128

If gt020 fails, here are the steps:

1Remove gt020 from active status using the following ifconfig command:

#ifconfig gt020 delete

2Assign the surviving card, gt010, the alias address:

#ifconfig gt010 198.174.11.129 255.255.255.128

From the router, use the grarp command to verify that the ARP table shows correct IP addresses and corresponding physical SP Switch addresses (Switch node number):

# grarp 198.174.11.1
gt020	(0):	198.174.11.1	at 0:0:0:0:0:2
gt020	(0):	198.174.11.129	at 0:0:0:0:0:2

SP Switch Router Adapter Guide - 1.4 Update 2 C-5