Port Trunking

Distributed Trunking

Distributed Trunking RestrictionsThere are several restrictions with distributed trunking.

■The port trunk links should be configured manually (manual LACP). Dynamic linking across switches is not supported.

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Only servers are supported as Distributed Trunking Devices (DTDs).A distributed trunk can span a maximum of two switches.

A maximum total of 60 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 60 manual trunks per switch includes distributed trunking manual trunks as well.

■IP routing and distributed trunking are mutually exclusive. Routing restrictions with distributed trunking are switch-wide and do not apply to the DT ports only.

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Meshing and DT switches are mutually exclusive.ARP protection is not supported on the distributed trunks.STP is disabled on DT ports.QinQ in mixed VLAN mode and distributed trunking are mutually exclu­ sive.

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SVLANs in mixed mode are not supported on DT or ISC links.DHCP snooping and IGMP snooping are not supported on DT links.

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