DT operating notes when updating software versions

When updating software from a version that does not support DT Keepalive (prior to version K.15.03) to a version that supports shared DT keepalive (K.15.03 and greater), use the following procedure:

Disable the ISC interface on both switches, and then upgrade the software. Assume a2 is configured as switch-interconnect.
```
(HP_Switch_name#) int a2 disable
(HP_Switch_name#) write mem
```
Configure one of the existing uplink VLANs as a keepalive VLAN, and then configure the destination keepalive IP address (peer’s keepalive IP address) on both switches at bootup.
```
(HP_Switch_name#) distributed-trunking
peer-keepalive vlan 2
(HP_Switch_name#) distributed-trunking
peer-keepalive destination 20.0.0.2
```
Ping the keepalive destination address to make sure that there is connectivity between the two DT switches (keepalive VLANs.)
Enable the ISC link on both switches and then execute write memory. Assume a2 is configured as switch-interconnect.
```
(HP_Switch_name#) int a2 enable
(HP_Switch_name#) write mem
```

When updating software from a software version that does not support DT keepalive (prior to version K.15.03) to a version with dedicated point-to-point keepalive (K.15.03 and greater), use the following procedure:

Disable the ISC interface on both switches, and then upgrade the software. Assume a2 is configured as switch-interconnect.
```
(HP_Switch_name#) int a2 disable
(HP_Switch_name#) write mem
```
At switch bootup, create a dedicated VLAN for keepalive, and assign only the keepalive link port as a member port of the VLAN. Configure the keepalive destination IP address.
```
(HP_Switch_name#) distributed-trunking
peer-keepalive vlan 2
(HP_Switch_name#) distributed-trunking
peer-keepalive destination 20.0.0.2
```
Ping the keepalive destination address to make sure that there is connectivity between the two DT switches (keepalive VLANs.)
Enable the ISC link on both switches, and then execute write memory. Assume a2 is configured as switch-interconnect.
```
(HP_Switch_name#) int a2 enable
(HP_Switch_name#) write mem
```

When updating software from a software version that does support shared DT keepalive (K.15.03, K.15.04) to a version that supports dedicated point-to-point keepalive (K.15.05), use the following procedure:

Disable the ISC interface and undo the keepalive configuration on both switches. Ignore the warning message that is displayed by the keepalive command while undoing the configuration. Upgrade the software. Assume a2 is configured as switch-interconnect.
```
(HP_Switch_name#) int a2 disable
(HP_Switch_name#) no distributed-trunking
peer-keepalive vlan
(HP_Switch_name#) write mem
```

At switch bootup, create a dedicated VLAN for keepalive and assign only the keepalive link port as a member port of the VLAN. Configure the keepalive destination IP address.

(HP_Switch_name#) vlan 10 

(dedicated point-to-point VLAN interface)
HP Switch(vlan-10)#
HP Switch(vlan-10)# untagged b2 

(keepalive link port)
HP Switch(vlan-10)# ip address 10.0.0.1/24
HP Switch(vlan-10)# exit
(HP_Switch_name#) distributed-trunking
peer-keepalive vlan 10
(HP_Switch_name#) distributed-trunking
peer-keepalive destination 10.0.0.2

Ping the keepalive destination address to make sure that there is connectivity between the two DT switches (keepalive VLANs.)
Enable the ISC link on both switches, and then execute write memory. Assume a2 is configured as switch-interconnect.
```
(HP_Switch_name#) int a2 enable
(HP_Switch_name#) write mem
```

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