Management and Configuration Guide K/KA/KB.15.15

• There can be eight links in a distributed trunk grouped across two switches, with a limit of
four links per distributed trunking switch.
• The limit of 144 manual trunks per switch includes distributed trunks as well.
• ARP protection is not supported on the distributed trunks.
• Dynamic IP Lockdown protection is not supported on the distributed trunks.
• QinQ in mixed VLAN mode and distributed trunking are mutually exclusive.
• Features not supported include:
SVLANs in mixed mode on DT or ISC links•
• Meshing
• CDP
• GVRP
• Multicast routing
• IPv6 routing
• MLD/MLD snooping on DT VLAN
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:
1. 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
2. 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
3. Ping the keepalive destination address to make sure that there is connectivity between the two
DT switches (keepalive VLANs.)
4. 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:
1. 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
2. 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
DT operating notes when updating software versions 169