Can,t detect mac address on specific Bridge-domain?

Hi Guys,

I just want to ask, What could be the reason if specific BD on trunk EFP can't detect any mac address?

Scenario:

VLAN10/VLAN20RTR ----- (SWTRUNK) ----- RTRVLAN10/VLAN20

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Let say that the vlan tagging is correct on both RTR, Now for comparison I can detect MAC on SW BD10 but no mac detected on Bridge-domain 20?

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Thanks