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Trunking between 2626's & 2650

jbielot_1
Occasional Advisor

Trunking between 2626's & 2650

Hi,

I'm trying to setup Trunking between a 2650 & (2) 2626's.

2626_1 ----- 2650 ----- 2626_2

Connections between 2626_1 & 2650 are (2) CAT5e patch cords (5ft long). Connections between the 2650 & 2626_2 is 2pr fiber with mini-GBIC's on each end.

The configs are listed below. When I connected the 2nd connection between the switches I was seeing a problem with ICMP (ping) packets being dropped, and hosts having communication problems. I unplugged the 2nd connection between the 'master' switch (2650) and the (2) 2626's and the errors went away. Switches have been running OK with a single connection between them for ~ 2 weeks now.

Can someone suggest what I might have missed or done incorrectly when setting the trunking up?

Thanks.

John

g2626_1# sho config

Startup configuration:

; J4900A Configuration Editor; Created on release #H.08.54

hostname "g2626_1"
snmp-server contact "John"
snmp-server location "Headquarters"
time timezone -300
time daylight-time-rule Continental-US-and-Canada
interface 25
disable
no lacp
exit
interface 26
disable
no lacp
exit
trunk 25-26 Trk1 LACP
ip default-gateway 192.168.10.3
sntp server 192.43.244.18
timesync sntp
sntp unicast
snmp-server community "SnMpPuBlIc" Unrestricted
vlan 1
name "DEFAULT_VLAN"
untagged 1-24,Trk1
ip address 192.168.10.7 255.255.0.0
exit
stack join 001185906000
spanning-tree Trk1 priority 4

g2626_1#

g2626_2# sho config

Startup configuration:

; J4900A Configuration Editor; Created on release #H.08.54

hostname "g2626_2"
snmp-server contact "John"
snmp-server location "Headquarters"
time timezone -300
time daylight-time-rule Continental-US-and-Canada
interface 25
no lacp
exit
interface 26
no lacp
exit
trunk 25-26 Trk2 LACP
ip default-gateway 192.168.10.3
sntp server 192.43.244.18
timesync sntp
sntp unicast
snmp-server community "SnMpPuBlIc" Unrestricted
vlan 1
name "DEFAULT_VLAN"
untagged 1-24,Trk2
ip address 192.168.10.8 255.255.0.0
exit
stack join 001185906000
spanning-tree Trk2 priority 4

g2626_2#

g2650_1# sho config

Startup configuration:

; J4899A Configuration Editor; Created on release #H.08.53

hostname "g2650_1"
snmp-server contact "John"
snmp-server location "Headquarters"
time timezone -300
time daylight-time-rule Continental-US-and-Canada
cdp run
interface 47
no lacp
exit
interface 48
no lacp
exit
interface 49
no lacp
exit
interface 50
no lacp
exit
trunk 47-48 Trk1 LACP
trunk 49-50 Trk2 LACP
ip default-gateway 192.168.10.3
sntp server 192.43.244.18
timesync sntp
sntp unicast
snmp-server community "SnMpPuBlIc" Unrestricted
vlan 1
name "DEFAULT_VLAN"
untagged 1-46,Trk1-Trk2
ip address 192.168.10.9 255.255.0.0
exit
stack commander "Master"
stack auto-grab
stack member 1 mac-address 00127910ec00
stack member 2 mac-address 001279101980
spanning-tree Trk1 priority 4
spanning-tree Trk2 priority 4
ip ssh version 1-or-2

g2650_1#

2 REPLIES
OLARU Dan
Trusted Contributor

Re: Trunking between 2626's & 2650

John,

I think that you most likely had loops between your switches. I dont fully understand the configurations, since we do not have HP 2600 series switches, but you migth want to look at interface configurations -especially the way you want your links aggregated-, and VLAN assignment for the interfaces including the TRKs.

What makes me think to loops is tha fact that your setup works OK when you suspend the second link between switches.

I hope this helps. Best regards,
Dan
jbielot_1
Occasional Advisor

Re: Trunking between 2626's & 2650

Thanks Dan. I suspect loops also. This is my first experience with HP switches. Have used Cisco switches in the past. I see that in the HP switches, there is a 'global' setting for Spanning-Tree. It's currently disabled. But in the configs, it does list spanning-tree for the 2 trunks that I created. So, is it necessary to enable spanning-tree globally? With the Cisco switches that I've worked with in the past (2900/3500/4000) it was done on a port/port basis and I don't recall running across a global setting.

John