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Cisco MGX 8850 Routing Switch Command Reference
Release 2.0, Part Number 78-10467-04 Rev C0, October 2001
Chapter2 Shelf Management Commands dspclksrcs
dspclksrcs
Display Clock Sources
Displays the configura t io n and status of the cloc k sources on the nod e. ( F or d etails about network
synchronization, see the description of cnfclksrc.) The dspclksrcs output consists of:
•For the primary clock: the type, source, status, and reason (for status change) of the clock.
•For the secondary clock: the type , source, status, and reason (fo r s tat us ch an ge ) of the clock.
•The active clock—the clock that currently provides synchronization. The active clock can be
primary, secondary, holdover, or i nt ernal.
•Whether revertive mode is enabled or disabled.
Note Changes to the configuration and status of clocks go into the database on the active PXM45. If a
standby (redundant) PXM45 exis ts, it receives the initial clock configuration and status but receives
internal status updates only when you in te rac t with t he node in a way that cha nge s a conf i gu rati on or
when the standby PXM45 switches to the active state.

Type of Clock Source

The type is either BITS or gene ric. Currently, generic applies to only an AX SM - sou r ced c lo ck . I f a
user-specified priority of clock is not configured, the source is null. For the current release, the null
source is presumed to be the i nt er n al osc illator.

Possible Sources

The source of the clock has the format [shelf.]slot[:subslot].port[:subport]. More typically, the source
has the two-part, short-hand form slot.line or slot.port. If the source is an AXSM, the format is slot.line.
For a BITS clock, the format is slot.port. The slot for a BITS clock is 7. The logical port is always 35 or
36. Port 35 refers to the upper external clock connector, and port 36 refers to the lower connector.

Clock Status

The status of a particular clock source can be one of the following:
•“ok” (good), which means the clock source is operational and stable.
(If the status is “ok,” then the Reason field shows “okay.” If the status is “ok,” the reason for the
status change described in the section, “Reason for Status Change,” is not important.)
•“bad” means a fault in the clock source has been detected. Use the Reason fiel d to h elp i sol at e t he
problem. See the section, “R easo n f or S t atu s C h ange .”
•“unknown” is a temporary string while the clock manager is sending a message to the clock source.
•“not configured” means that this source—primary or secondary—has not been configured.

Reason for Status Change

The reasons that clock status can chan ge ar e n u mer o us. Th e dspc lksrcs command displays a Reason
field for both the primary and the secondary clock source. The reason can include the first-time,
user-specification of the clock source. The reason strings and their meaning appear in Table 2-9 .
Additional information abou t “okay ” and the locking process fo llow s.