GbE2 Reports Packet Errors when Activating XConnect

[Sergio Ribeiro_1]

Hi all.

I have an issue with a enclosure with 2 GbE2. Basically what happens is that when i activate the XConnect Ports (17 & 18) Blade Servers loose the connection and packet errors are reported.
I believe this is a trunk issue but, beside activating the trunk and enabling SIP and DIP as protocol, do I have to make ports 17 and 18 member of all the Vlans that transverse that link?

Can someone please give me a working example of a environmentlike this?

Another quick question: is there a number maximum of Vlans that can transverse a trunk in GbE2 or is it unlimited? I have 7 or 8 Different Vlans.


This is the actual configuration:

/c/l2/vlan 1
name "Default"
def 1 2 5 6 13 14 17 18 24
/c/l2/vlan 200
ena
name "HeartBeat"
def 3 7 15 20
/c/l2/vlan 300
ena
name "Gest"
def 19
/c/l2/vlan 400
ena
name "ServerFarm"
def 4 16 19 23
/c/l2/vlan 500
ena
name "CRM_LoadBalancer"
def 8 11 19
/c/l2/vlan 600
ena
name "DMZ_FrontEnd"
def 10 12 21 22
/c/l2/vlan 700
ena
name "DMZ_BackEnd"
def 9 21 22

This is the configuration i believe will solve this issue:

Trunk Group 1
Protocol - Static
Current settings: enabled
ports: 17, 18
Current IP Trunk Hash IP trunk hash settings:
sip dip


/c/l2/trunk/1/add/17-18
/c/l2/thash/sip/enable
/c/l2/thash/dip/enable

/c/l2/vlan 1
name "Default"
def 1 2 5 6 13 14 17 18 24
/c/l2/vlan 200
ena
name "HeartBeat"
def 3 7 15 17 18 20
/c/l2/vlan 300
ena
name "Gest"
def 17 18 19
/c/l2/vlan 400
ena
name "ServerFarm"
def 4 16 17 18 19 23
/c/l2/vlan 500
ena
name "LoadBalancer"
def 8 11 17 18 19
/c/l2/vlan 600
ena
name "DMZ_FrontEnd"
def 10 12 17 18 21 22
/c/l2/vlan 700
ena
name "DMZ_BackEnd"
def 9 17 18 21 22


Thanks a lot for your reply.

[HEM_2]

p-Class or c-Class?

p-Class:
ports 17 and 18 (XConnects) on a GBE2p are enabled default and are configured as trunk 1 (aka a port channel). Ports 17 and 18 are only in vlan 1 by default (i.e. access ports in Vlan 1)

c-Class:
ports 17 and 18 are disabled by default. If you enable them they are automatically configured as trunk 1 and are in VLAN 1 by default.

You are correct. In order for the XConnects to work like dot1q trunks (carry all VLANs), ports 17 and 18 need to be tagged and be added as members of the desired VLANs. The config for ports 17 and 18 on both gbe2 switches in a pair must be identical.

Your proposed config looks good as long as you tag ports 17 and 18.

And the trunk hashing algorithm doesn't need to be modified in order for this to work. I think the default is sip dip anyway.

I believe the GBE2 switches support up to 256 VLANs and there is no limitation to the number of VLANs a port (like 17 and 18) can be a member of.