7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
Figure 24: Ethernet multicast ports
Note:
7210 SAS platforms do not support ordinary clock timeTransmitter configuration.
The IEEE 1588v2 standard includes the concept of PTP profiles. These profiles are defined by industry
groups or standards bodies that define the use of IEEE 1588v2 for specific applications.
The following profiles are supported for 7210 SAS platforms (as described in Table 33: IP/UDP unicast and
Ethernet multicast support):
• IEEE 1588v2 (default profile)
• ITU-T Telecom profile (G.8265.1)
• ITU-T Telecom profile for time with full timing support (G.8275.1)
Note:
The following caveats apply to G.8275.1 support. See sectionConfiguration guidelines and
restrictions for PTP for configuration guidelines and restrictions.
• PTP with Ethernet encapsulation is only supported with G.8275.1 profiles.
• PTP over IP encapsulation is only with the IEEE 1588v2 and G.8265.1 profiles; it is not
supported for G.8275.1 profiles.
When a 7210 SAS receives Announce messages from one or more configured peers or multicast
neighbors, it executes a Best timeTransmitter Clock Algorithm (BTCA) to determine the state of
communication between itself and the peers. The system uses the BTCA to create a hierarchical topology,
allowing the flow of synchronization information from the best source (the grandmaster clock) out through
the network to all boundary and timeReceiver clocks. Each profile has a dedicated BTCA.
If the profile setting for the clock is "ieee1588-2008", the precedence order for the BTCA is as follows:
3HE 18197 AAAB TQZZA
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