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.