Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 1005
Configuring VLT, RSTP on VLT peers to prevent forwarding loops-VLT peer 1, a VLT Interconnect
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Configure RSTP on VLT peers to prevent forwarding loops-VLT peer 1 Dell_VLTpeer1(conf)#protocol spanning-tree rstp Dell_VLTpeer1(conf-rstp)#no disable Dell_VLTpeer1(conf-rstp)#bridge-priority 4096 Configure RSTP on VLT peers to prevent forwarding loops-VLT peer 2 Dell_VLTpeer2(conf)#protocol spanning-tree rstp Dell_VLTpeer2(conf-rstp)#no disable Dell_VLTpeer2(conf-rstp)#bridge-priority 0 NOTE: When you remove the VLT configuration, RSTP is recommended as a backup solution to avoid spanning-tree loops. In this case, you can use the following RSTP default values: • hello-time: 2 seconds • forward-delay: 15 seconds • max-age: 20 There is no additional performance gain on VLT, if you configure the RSTP values other than the default values. Configuring VLT To configure VLT, use the following procedure. Prerequisites: Before you begin, make sure that both VLT peer switches are running the same Dell EMC Networking OS version and are configured for RSTP as described in the RSTP Configuration section. For VRRP operation, ensure that you configure VRRP groups and L3 routing on each VLT peer as described in VLT and VRRP interoperability in the Configuration Notes section. To configure VLT and create a VLT domain in which two switches are physically connected and treated as a single port channel by access devices, configure the following settings on each VLT peer device. 1 Configure the VLT interconnect for the VLT domain. The primary and secondary switch roles in the VLT domain are automatically assigned after you configure both sides of the VLTi. NOTE: If you use a third-party ToR unit, to avoid potential problems if you reboot the VLT peers, Dell EMC recommends using static LAGs on the VLTi between VLT peers. 2 Enable VLT and create a VLT domain ID. VLT automatically selects a system MAC address. 3 Configure a backup link for the VLT domain. 4 (Optional) Manually reconfigure the default VLT settings, such as the MAC address and VLT primary/ secondary roles. 5 Connect the peer switches in a VLT domain to an attached access device (switch or server). Configuring a VLT Interconnect To configure a VLT interconnect, follow these steps. 1 Configure the port channel for the VLT interconnect on a VLT switch and enter interface configuration mode. CONFIGURATION mode interface port-channel id-number Virtual Link Trunking (VLT) 1005
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