Distributed trunking restrictions
There are several restrictions with distributed trunking:
Beginning with software version K.15.07, the switch will not allow both Distributed Trunking and MAC-based mirroring to function simultaneously. The switch will respond as follows:
If the user attempts to configure both, an error message will appear.
When a switch is updated from older software to K.15.07, if the older config file has both Distributed Trunking and MAC-based mirroring, the switch will automatically remove the MAC-based mirroring lines from the config file, and will give an explanatory error message.
If a switch is running K.15.07 and an existing config file that has both Distributed Trunking and MAC-based mirroring is loaded onto the switch, the switch will automatically remove the MAC-based mirroring lines from the config file, and will give an explanatory error message.
All DT linked switches must be running the same software version.
The port trunk links should be configured manually (using manual LACP or manual trunks.) Dynamic linking across switches is not supported.
A distributed trunk can span a maximum of two switches.
A maximum total of 144 servers can be connected to two DT switches. Each server can have up to four physical links aggregated in a single switch, meaning that there can be a maximum of eight ports (four aggregated links for each DT switch) included in a DT trunk.
Only one ISC link is supported per switch, with a maximum of 60 DT trunks supported on the switch. The ISC link can be configured as a manual LACP trunk, non-protocol trunk, or as an individual link. Dynamic LACP trunks are not supported as ISCs.
An ISC port becomes a member of all VLANs that are configured on the switch. When a new VLAN is configured, the ISC ports become members of that VLAN.
Port trunk links can be done only on a maximum of two switches that are connected to a specific server.
Any VLAN that is in a distributed trunk must be configured on both switches. By default, the distributed trunk belongs to the default VLAN.
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.
Source Port Filter cannot be configured on an InterSwitch Connect (ISC) port.
- Features not supported include:
SVLANs in mixed mode on DT or ISC links
Meshing
IPv6 routing