Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

network-clock-participate

Hi,

is there anyone who can kindly show me when to use the network-clock-participate command?

Is it needed in a router with 2 VWIC BRI (2 ports) connected to the same provider?

Regards

2 ACCEPTED SOLUTIONS

Accepted Solutions
Hall of Fame Super Gold

Re: network-clock-participate

As well network-clock-select, it's needed if you do fax or modem. Otherwise, it's recommended to have but no problems should occur if you don't.

Re: network-clock-participate

If there are slips the best idea is to start doing loopback tests on the links. Make a T1 loopback cable (1-4, 2-5, hairpinned) and see if any of the sides are getting slips.

In your 4 examples, if all 4 BRI ports go to the same clocking domain, they will be equivalent. Many people like to use a preference of 2 in case one goes down as well.

-nick

7 REPLIES
Hall of Fame Super Gold

Re: network-clock-participate

As well network-clock-select, it's needed if you do fax or modem. Otherwise, it's recommended to have but no problems should occur if you don't.

Re: network-clock-participate

Each set of DSPs have one clock. By default, the DSPs will be sync'd to the internal self-created clock.

Even when you configured 'clock source line', the DSPs choose the internal clock first.

If you have 2 PRIs for example, one to two different providers, you will be connected to two different 'clocking domains'. This command allows you to choose which timing you would like to sync to.

As long as both of your BRIs are on the same clocking domain, you should be fine. Use the network-clock-select command to choose your provider's clock for the DSPs to sync to.

If you do have slips, you can have slight clicks and pops on the line, as well as fax failures.

hth,

nick

New Member

Re: network-clock-participate

Hi,

thanks for the reply.

So, if I have 2 VIC2-2BRI-NT/TE modules in the same router (interface BRI0/0/0

interface BRI0/0/1 interface BRI0/1/0 and

interface BRI0/1/1) all connected to the same provider, the following configurations are correct:

network-clock-participate wic 0

network-clock-participate wic 1

network-clock-select 1 BRI0/0/0

that is the same of

network-clock-participate wic 0

network-clock-participate wic 1

network-clock-select 1 BRI0/0/1

that is the same of

network-clock-participate wic 0

network-clock-participate wic 1

network-clock-select 1 BRI0/1/0

that is the same of

network-clock-participate wic 0

network-clock-participate wic 1

network-clock-select 1 BRI0/1/1

is it correct?

nick, is there a way to debug if there are slips?

Re: network-clock-participate

If there are slips the best idea is to start doing loopback tests on the links. Make a T1 loopback cable (1-4, 2-5, hairpinned) and see if any of the sides are getting slips.

In your 4 examples, if all 4 BRI ports go to the same clocking domain, they will be equivalent. Many people like to use a preference of 2 in case one goes down as well.

-nick

Hall of Fame Super Gold

Re: network-clock-participate

You cannot do loopback tests on a BRI interface, neither in software nor using a crossed cable.

However, on BRI slips will show as CRC and other errors on the D-channel /0/x/y:0 consequently it's always recommended to use network-clock-select. The drawback is that will clutter your log a little.

Again I'd like to remind the OP to please rate useful posts with the scrollbox below.

New Member

Re: network-clock-participate

thank you for your answers!

Hall of Fame Super Gold

Re: network-clock-participate

You're welcome, thank you for the nice rating and good luck.

8923
Views
0
Helpful
7
Replies
CreatePlease to create content