Network OS Administration Guide

Supporting Network OS 6.0.1a

Part Number: 53-1003768-04

Guidelines and restrictions for long-distance Metro VCS

Consider the following guidelines and restrictions when configuring long-distance Metro VCS:

  • Long-distance-ISLs are only supported on 10G interface links.
  • Only one long-distance-ISL is supported within a single port group.
  • Long-distance-ISL is not supported on 10G copper RJ-45 interfaces
  • Long-distance-ISL is not supported on 40G-to-10G breakout interfaces
  • Brocade trunking is not supported with long-distance ISLs, but up to eight 8-link ECMP trunks can be used.
  • Edge ports within the same port group where a long-distance ISL is configured cannot be configured with DCB maps.
  • Edge ports within the same port group where a long-distance ISL is configured cannot be configured by means of the fcoeport default command.
  • A maximum of three PFCs can be supported on a Metro VCS configured platform. By default, PFC is enabled by class 3 and 7.
  • The Brocade VDX 6740 switches support only two PFCs.
  • All the ports in the port group are rebooted when a port is configured for long distance.
  • For 2-, 5-, 10-km long distance, use Brocade-supported long-range (LR) optics for direct connectivity.
  • For 30-km long distance, use Brocade-supported extended-range (ER) optics for direct connectivity.
  • A port group containing a long-distance port cannot have a CEE map configuration on any edge port.
  • For 2-km and 5-km long-distance ISLs, one additional standard ISL connection is supported on the same long-distance port group.
  • Lossless FCoE traffic is supported up to 10 km with long-distance ISL configured.
  • Lossy Layer 2/Layer 3 traffic is supported up to 30 km with long-distance ISL configured.