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Configure Sync-E on Cisco MWR2941

Dear friends,

I got a trouble when configure Sync-E on this Cisco Devices.

Topo1: Cisco7600 --- MWR1

This Topo is working fine because we can configure interface gigabit ethernet on Cisco 7600 as a Sync-E source with this command:

interface GigabitEthernet 3/1
synchronous mode
clock source internal

On MWR we use this command: network-clock-select 1 Sync 0

Topo2: Cisco 7600 --- MWR1 ---- MWR2

Configuration on 7600 and MWR1 are the same as Topo1 but the port to connect to MWR2 on MWR1 we can not configure it to transmit Sync-E like 7600.

I am using this IOS Release Notes for Cisco MWR 2941 Mobile Wireless Edge Router for Cisco IOS Release 12.2(33)MRB

Please help me to find out the trouble!

Thanks a lot,

Do Thanh Son