System Management
244
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
Each PTP boundary clock is configured for a specific slot where the card (see
Table 26) or Ethernet port (see Table 25) will perform the boundary clock function.
On the 7705 SAR-M, 7705 SAR-H, 7705 SAR-Hc, 7705 SAR-A, 7705 SAR-Ax,
7705 SAR-W, and 7705 SAR-Wx, this slot is always 1/1. On the 7705 SAR-X, this
slot is always either 1/2 or 1/3. When the 7705 SAR-M is receiving PTP packets on
a 2-port 10GigE (Ethernet) module, its PTP clock continues to use slot 1/1. Each
boundary clock is also associated with a loopback address for the router; however,
the IP interface configured on a 2-port 10GigE (Ethernet) module cannot be
associated with a boundary clock.
Each boundary clock can be peered with up to 50 slaves, boundary clocks, or grand
master clocks. The IP addresses of these peers can be statically configured via CLI
or dynamically accepted via PTP signaling messages. A statically configured peer
may displace a dynamic peer on a particular PTP port. If there are fewer than 50
peers, then that dynamic peer can signal back and be granted a different PTP-port
instance.
Figure 21 shows an example of boundary clock operation.
Figure 21 Boundary Clock Operation
CSM B
1588v2
Grand
Master
21309
Ethernet
Ethernet
Ethernet
OC3/STM1
T1/E1/DS3/E3
Eth
Port
Eth
Port
CSM A
Packet
Network
Boundary
Clock
Switch
Boundary
Clock
Eth Port
POS Port
PPP Port
SSU
Boundary Clock
Boundary Clock
Boundary Clock
Boundary Clock
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