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SP Switch Router Adapter Guide - 1.4 Update 2 C-5
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.
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:
1 Remove gt010 from active status using the following ifconfig command:
# ifconfig gt010 delete
2 Assign the surviving card, gt020, the alias address:
# ifconfig gt020 198.174.11.1 255.255.255.128
If gt020 fails, here are the steps:
1 Remove gt020 from active status using the following ifconfig command:
# ifconfig gt020 delete
2 Assign 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 card 1 - gt010
mask 255.255.255.0
net 198.174.11.0
Partition
SP Switch Router
Adapter card 2 - gt020
net 198.174.11.128
mask 255.255.255.128
SP
Switch
Router
New ARP table
card 198.174.11.1
card 198.174.11.129
SP processor node
SP processor node
SP processor node
SP
Switch
2
3
1
4
5
gt020 (0): 198.174.11.1 => 0:0:0:0:0
:
gt020 (0): 198.174.11.1 => 0:0:0:0:0
:
card 198.174.11.1
Switch node number
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