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Problem with multiple VLANs across multiple switches
I am having an issue with VLAN traffic across switches. Here is my diagram. Switch 1 is a distribution switch. Switch 2 and switch 3 have computers connected to them. The link between switch 1 and switch 2 is sw1 port 8 and sw2 port 8. Link between switch 1 and switch 3 is sw1 port 7 and sw3 port 8. Here are the VLAN memberships for each switch:
Switch 1
VLAN 1
1 2 3 4 5 6 7 8
U U U U U U U U
VLAN 10
1 2 3 4 5 6 7 8
T T
PVID of all ports = 1
-------------------
Switch 2
VLAN 1
1 2 3 4 5 6 7 8
U U U U U U
VLAN 10
1 2 3 4 5 6 7 8
U U T
PVID of port 5 & 6 = 10
PVID of all other ports = 1
-------------------
Switch 3
VLAN 1
1 2 3 4 5 6 7 8
U U U U U U
VLAN 10
1 2 3 4 5 6 7 8
U U T
PVID of port 5 = 10
PVID of all other ports = 1
------------------
All port ports are set to VLAN mode of TRUNK. Now, nodes on ports 5 and 6 of switch 2 can communicate with each other. Nodes on ports 5 and 6 of switch 3 can communicate, and all nodes on VLAN1 can communicate. But I have no connectivity between VLAN 10 on switch 2 and VLAN 10 on switch 3. So I suspect my problem is on switch 1. Any recommendations on how to correct?
piotr_m
11 Posts
0
September 28th, 2011 01:00
Can you provide output of:
show run
show mac address-table or
show bridge address-table (depending of the switch)
Which switch do you refer to?
Alex Long
8 Posts
0
September 28th, 2011 10:00
Here is the show run output from switch 1, which is a PowerConnect 5448 switch. The mac address table is 216 lines long. Do you want to see the full output or just a sample?
switch1# show run
interface ethernet g47
shutdown
exit
interface range ethernet all
switchport mode trunk
exit
vlan database
vlan 2,10
exit
interface range ethernet g(14,25,27)
switchport trunk allowed vlan add 2
exit
interface range ethernet g(2-14,44-48)
switchport trunk allowed vlan add 10
exit
interface vlan 2
name "VLAN 2"
exit
interface vlan 10
name "VLAN 10"
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
iscsi target port 860 address 0.0.0.0
iscsi target port 3260 address 0.0.0.0
interface vlan 1
ip address 192.168.1.25 255.255.255.0
exit
ip default-gateway 192.168.1.1
hostname switch1
username admin password aaaaaaaaaaaaaaaaaaaaaaaaaaaa level 15 enc
rypted
snmp-server location "Datacenter"
snmp-server community public ro view Default
clock timezone -6
clock summer-time recurring usa
clock source sntp
sntp server 192.168.1.2 poll
Default settings:
Service tag: #######
SW version 2.0.0.46 (date 14-Apr-2011 time 13:10:53)
Gigabit Ethernet Ports
=============================
no shutdown
speed 1000
duplex full
negotiation
flow-control off
mdix auto
no back-pressure
interface vlan 1
interface port-channel 1 - 8
spanning-tree
spanning-tree mode STP
qos basic
qos trust cos
piotr_m
11 Posts
0
September 29th, 2011 01:00
You Have Configured ports as trunks to other switches.
interface range ethernet g(2-14,44-48)
switchport trunk allowed vlan add 10
Can you provide show run from sw2 and sw3?
Alex Long
8 Posts
0
September 29th, 2011 12:00
Is that not correct to configure ports to other switches as trunks? Here is the output from switch 2. Switch 3 is a VMWare virtual switch.
switch2# show run
interface range ethernet all
switchport mode trunk
exit
vlan database
vlan 10,100
exit
interface range ethernet g(18-19)
switchport trunk native vlan 10
exit
interface range ethernet g(1-17,20-24)
switchport trunk allowed vlan add 10
exit
interface vlan 10
name "VLAN10"
exit
interface vlan 1
ip address 192.168.1.27 255.255.5.0
exit
ip default-gateway 192.168.11
username admin password ffffffffffffffffffffffffffffffffff level 15 enc
rypted
jp1110
67 Posts
0
October 6th, 2011 23:00
DId you get your answer?
Alex Long
8 Posts
0
October 7th, 2011 08:00
No, I sure didn't. I'm pretty sure that the problem is how I have the uplink ports between the switches configured, but I am just not sure what the correct config is. And I am in a remote location, so if I screw up by experimenting then I might isolate half my network, so I can't really just play around with it until I find something that works.
jp1110
67 Posts
0
October 11th, 2011 00:00
Agreed. Experimentation is not what we should be doing. However, there's a lot going on here so lets depict these switches one by one from the top. Let see if we can get you running on this.
- Switch 1 has ALL switchports configured in TRUNK Mode. Supports VLANs 2 & 10.
Switchport 14 passes both 2 & 10 where others only 1 VLAN.
- Switch 2 has ALL switchports configured in TRUNK Mode. Supports VLANs 10 & 100 (100 not used)
All switchports pass only VLAN 10.
- Switch 3 dedicated to VMware but no running config discplayed. (missing running config)
??? running config.
Question:
- Can you provide the running config for switch 3 (VMWare switch)?
- Which ports are you calling your UPLINK Ports for Switch 1, 2, and 3?
- Which VLANs are you wanting to pass among the switches via your uplinks?
Alex Long
8 Posts
1
October 11th, 2011 11:00
Well, I got it working. What I did was set GVRP Global Status to enable on all switches, and I set the GVRP State to Enable on the uplink ports. I talked to one of the PowerConnect support guys who said this shouldn't be necessary. But it wasn't working before I did this and it was working after I did it. So go figure. Thanks to you guys for your help.
jp1110
67 Posts
0
October 11th, 2011 20:00
Good to hear you got it working.