Distributed Trunking Cheat Sheet

MVP
MVP
Q:

Is there a Distributed Trunking Cheat Sheet?



A:

Distributed Trunking Cheat Sheet

You must configure the ISC ports before you can configure the trunks for distributed trunking.

To configure an ISC port, enter this command:

Syntax: switch-interconnect <port-num | trk1...trkN>

                switch-interconnect  b21
 

To configure distributed trunking on the switch, enter this command:

Syntax: trunk <port-list> <trk1 | trk2 ... trkN> [trunk | lacp | dt-lacp] no trunk <port-list>      trunk b11 trk1 dt-lacp

Configures distributed trunking on a switch. Use the dt-lacp option. The trunk groups must be identical in both switches, for example, if Switch Local is configured with trk1 and uses the dt-lacp option, Switch Remote must be configured with trk1 and use the dt-lacp option also in order to form a Distributed Trunk.

 

Example of Configuring Distributed Trunking:

ProCurve Switch Local(config)# switch-interconnect a7

ProCurve Switch Remote(config)# switch-interconnect b9

ProCurve Switch Local(config)# trunk a9 trk10 dt-lacp

ProCurve Switch Remote(config)# trunk a9 trk10 dt-lacp

 

To display information about the distributed trunks, enter the show lacp distributed command.

Syntax: show lacp [distributed]

 

Distributed Trunking Restrictions

There are several restrictions with distributed trunking.

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

■ 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.

■ 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 exclusive.

■ 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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Comments

To be clear, does the restriction "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." mean that VRRP can't be implemented on a pair of already "DT interconnected" chassis? Thanks.

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