Dell PowerEdge XL 5133-4 MXL 10/40GbE Switch IO Module FTOS Command Reference - Page 81
Auto-Detection of the DCBX Version, DCBX Example, servers are also installed.
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Auto-Detection of the DCBX Version The Aggregator operates in auto-detection mode so that a DCBX port automatically detects the DCBX version on a peer port. Legacy CIN and CEE versions are supported in addition to the standard IEEE version 2.5 DCBX. A DCBX port detects a peer version after receiving a valid frame for that version. The local DCBX port reconfigures to operate with the peer version and maintains the peer version on the link until one of the following conditions occurs: • The switch reboots. • The link is reset (goes down and up). • The peer times out. • Multiple peers are detected on the link. DCBX operations on a port are performed according to the auto-configured DCBX version, including fast and slow transmit timers and message formats. If a DCBX frame with a different version is received, a syslog message is generated and the peer version is recorded in the peer status table. If the frame cannot be processed, it is discarded and the discard counter is incremented. DCBX Example Figure 6-7 shows how DCBX is used on an Aggregator installed in a PowerEdge M1000e chassis in which servers are also installed. • The external 40GbE ports on the base module (ports 33 and 37) of two switches are used for uplinks configured as DCBX auto-upstream ports. The Aggregator is connected to third-party, top-of-rack (ToR) switches through 40GbE uplinks. The ToR switches are part of a Fibre Channel storage network. • The internal ports (ports 1-32) connected to the 10GbE backplane are configured as auto-downstream ports. • On the Aggregator, PFC and ETS use DCBX to exchange link-level configuration with DCBX peer devices. Data Center Bridging (DCB) | 67