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Beginner

Distribution to Access layer trunking

Have you guys seen a problem like this before?  After a shutdown due to power outage, some vlans being trunked to an access layer switch would not pass traffic.  Some vlans connected and allowed traffic, some did not.  We had to disable and re-enable to trunk port on the distribution switch to get all of the vlan to pass traffic.

Aside from not passing traffic, the vlans, interfaces and trunking configs are normal.  The only way you can tell that the vlan is not passing traffic is the loss of connection with the end devices (PCs, printers, etc..).

standard trunk port config on distribution side (3750E ver 15.0(2)SE):

description ***Uplink to wiring closet 1***

switchport trunk encapsulation dot1q

switchport trunk native vlan 668

switchport trunk allowed vlan 10,30-38,131,190,200,211,711,900,911

switchport mode trunk

switchport nonegotiate

srr-queue bandwidth share 10 10 60 20

queue-set 2

priority-queue out

mls qos trust cos

auto qos voip trust

standard access layer trunk port config (3750 ver 12.2(50)SE3):

description ***Uplink to MDF***

switchport trunk encapsulation dot1q

switchport trunk native vlan 668

switchport mode trunk

switchport nonegotiate

srr-queue bandwidth share 10 10 60 20

queue-set 2

priority-queue out

mls qos trust cos

auto qos voip trust

3 REPLIES 3
Beginner

Distribution to Access layer trunking

Hey......I dont think there is any issue with the configuration.......did you see any logs (POST failures etc) when the device was coming up?

Beginner

Distribution to Access layer trunking

No I didn't catch the POST on the switches during reboot.  The access-layer switches came back up when power was restored. 

Advisor

Distribution to Access layer trunking

   Shouldn't make any difference but I would make what is being allowed across the trunk equal on both sides. One side allows all vlans and the other side is restricting to certain vlans.

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