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33839
April 25th, 2008 01:00
LAG and VLAN Help
Hello, all.
I have a 4-port LAG connecting two 5448 switches that i'm trying to isolate on VLAN 1000. Here is my config, that doesn't currently seem to be working:
on switch A
vlan database
vlan 1000
exit
int range eth g(1-4)
switchport access vlan 1000
int range eth g(41-44)
channel-group 1 mode auto
int port-channel 1
switchport mode general
switchport general allowed vlan add 1000
on Switch B
vlan database
vlan 1000
exit
int range eth g(5-8)
switchport access vlan 1000
int range eth g(41-44)
channel-group 1 mode auto
int port-channel 1
switchport mode general
switchport general allowed vlan add 1000
Assuming that the LAG is on the same port numbers on both switches (41-44), will ports 1-4 on Switch A be able to communicate with port 5-8 on Switch B?
Thanks for your help in advance!
Joe
bh1633
909 Posts
0
April 25th, 2008 14:00
Set the pvid on the port-channel to 1000.
joe.cruz
9 Posts
0
April 25th, 2008 15:00
Thanks, bh1633.
I added that setting, but it didn't help. I think i may be having a Spanning Tree problem. On one switch, the STP status is "Forwarding". On the other switch, the STP status is "Blocking".
Here's the running-config if it helps; note the actual ports in the port-channel are slightly different than the original hypothetical.
Thanks a lot in advance!
spanning-tree bpdu filteringinterface port-channel 1
spanning-tree cost 4
exit
interface range ethernet g(1-40)
spanning-tree disable
exit
interface port-channel 2
shutdown
exit
interface port-channel 3
shutdown
exit
interface port-channel 4
shutdown
exit
interface port-channel 5
shutdown
exit
interface port-channel 6
shutdown
exit
interface port-channel 7
shutdown
exit
interface port-channel 8
shutdown
exit
interface range ethernet g(5-45)
shutdown
exit
interface port-channel 1
switchport mode general
exit
vlan database
vlan 1000
exit
interface port-channel 1
switchport general pvid 1000
exit
interface range ethernet g(1-4)
switchport access vlan 1000
exit
interface port-channel 1
switchport general allowed vlan add 1000
exit
interface vlan 1000
name iSCSI
exit
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______________
interface range ethernet g(41-44)
channel-group 1 mode auto
exit
iscsi target port 860 address 0.0.0.0
iscsi target port 3260 address 0.0.0.0
interface vlan 1
ip address 10.0.0.94 255.255.254.0
exit
username admin password level 15 encrypted
snmp-server community Dell_Network_Manager rw view DefaultSuper
joe.cruz
9 Posts
0
April 25th, 2008 15:00
Here you go. Thanks for having a look.
console# show spanning-tree
Spanning tree enabled mode RSTP
Default port cost method: short
Root ID Priority 32768
Address 00:04:96:18:5e:7b
Cost 6
Port g46
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768
Address 00:1e:4f:0e:45:6c
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Number of topology changes 10 last change occurred 00:02:26 ago
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Interfaces
Name State Prio.Nbr Cost Sts Role PortFast Type
------ -------- -------- --------- ------ ---- -------- ----------------
g1 disabled 128.1 100 DSBL Dsbl No -
g2 disabled 128.2 100 DSBL Dsbl No -
g3 disabled 128.3 4 DSBL Dsbl No -
g4 disabled 128.4 100 DSBL Dsbl No -
g5 disabled 128.5 100 DSBL Dsbl No -
g6 disabled 128.6 100 DSBL Dsbl No -
g7 disabled 128.7 100 DSBL Dsbl No -
g8 disabled 128.8 100 DSBL Dsbl No -
g9 disabled 128.9 100 DSBL Dsbl No -
g10 disabled 128.10 100 DSBL Dsbl No -
g11 disabled 128.11 100 DSBL Dsbl No -
g12 disabled 128.12 100 DSBL Dsbl No -
g13 disabled 128.13 100 DSBL Dsbl No -
g14 disabled 128.14 100 DSBL Dsbl No -
g15 disabled 128.15 100 DSBL Dsbl No -
g16 disabled 128.16 100 DSBL Dsbl No -
g17 disabled 128.17 100 DSBL Dsbl No -
g18 disabled 128.18 100 DSBL Dsbl No -
g19 disabled 128.19 100 DSBL Dsbl No -
g20 disabled 128.20 100 DSBL Dsbl No -
g21 disabled 128.21 100 DSBL Dsbl No -
g22 disabled 128.22 100 DSBL Dsbl No -
g23 disabled 128.23 100 DSBL Dsbl No -
g24 disabled 128.24 100 DSBL Dsbl No -
g25 disabled 128.25 100 DSBL Dsbl No -
g26 disabled 128.26 100 DSBL Dsbl No -
g27 disabled 128.27 100 DSBL Dsbl No -
g28 disabled 128.28 100 DSBL Dsbl No -
g29 disabled 128.29 100 DSBL Dsbl No -
g30 disabled 128.30 100 DSBL Dsbl No -
g31 disabled 128.31 100 DSBL Dsbl No -
g32 disabled 128.32 100 DSBL Dsbl No -
g33 disabled 128.33 100 DSBL Dsbl No -
g34 disabled 128.34 100 DSBL Dsbl No -
g35 disabled 128.35 100 DSBL Dsbl No -
g36 disabled 128.36 100 DSBL Dsbl No -
g37 disabled 128.37 100 DSBL Dsbl No -
g38 disabled 128.38 100 DSBL Dsbl No -
g39 disabled 128.39 100 DSBL Dsbl No -
g40 disabled 128.40 100 DSBL Dsbl No -
g45 enabled 128.45 100 DSBL Dsbl No -
g46 enabled 128.46 4 FRW Root No P2p (STP)
g47 enabled 128.47 100 DSBL Dsbl No -
g48 enabled 128.48 100 DSBL Dsbl No -
ch1 enabled 128.49 4 DSCR Altn No P2p (RSTP)
ch2 enabled 128.50 4 DSBL Dsbl No -
ch3 enabled 128.51 4 DSBL Dsbl No -
ch4 enabled 128.52 4 DSBL Dsbl No -
ch5 enabled 128.53 4 DSBL Dsbl No -
ch6 enabled 128.54 4 DSBL Dsbl No -
ch7 enabled 128.55 4 DSBL Dsbl No -
ch8 enabled 128.56 4 DSBL Dsbl No -
joe.cruz
9 Posts
0
April 25th, 2008 15:00
console# sho interface status
Flow Link Back Mdix
Port Type Duplex Speed Neg ctrl State Pressure Mode
-------- ------------ ------ ----- -------- ---- ----------- -------- ----
g1 1G-Copper -- -- -- -- Down -- --
g2 1G-Copper -- -- -- -- Down -- --
g3 1G-Copper Full 1000 Enabled Off Up Disabled On
g4 1G-Copper -- -- -- -- Down -- --
g5 1G-Copper -- -- -- -- Down -- --
g6 1G-Copper -- -- -- -- Down -- --
g7 1G-Copper -- -- -- -- Down -- --
g8 1G-Copper -- -- -- -- Down -- --
g9 1G-Copper -- -- -- -- Down -- --
g10 1G-Copper -- -- -- -- Down -- --
g11 1G-Copper -- -- -- -- Down -- --
g12 1G-Copper -- -- -- -- Down -- --
g13 1G-Copper -- -- -- -- Down -- --
g14 1G-Copper -- -- -- -- Down -- --
g15 1G-Copper -- -- -- -- Down -- --
g16 1G-Copper -- -- -- -- Down -- --
g17 1G-Copper -- -- -- -- Down -- --
g18 1G-Copper -- -- -- -- Down -- --
g19 1G-Copper -- -- -- -- Down -- --
g20 1G-Copper -- -- -- -- Down -- --
g21 1G-Copper -- -- -- -- Down -- --
g22 1G-Copper -- -- -- -- Down -- --
g23 1G-Copper -- -- -- -- Down -- --
g24 1G-Copper -- -- -- -- Down -- --
g25 1G-Copper -- -- -- -- Down -- --
g26 1G-Copper -- -- -- -- Down -- --
g27 1G-Copper -- -- -- -- Down -- --
g28 1G-Copper -- -- -- -- Down -- --
g29 1G-Copper -- -- -- -- Down -- --
g30 1G-Copper -- -- -- -- Down -- --
g31 1G-Copper -- -- -- -- Down -- --
g32 1G-Copper -- -- -- -- Down -- --
g33 1G-Copper -- -- -- -- Down -- --
g34 1G-Copper -- -- -- -- Down -- --
g35 1G-Copper -- -- -- -- Down -- --
g36 1G-Copper -- -- -- -- Down -- --
g37 1G-Copper -- -- -- -- Down -- --
g38 1G-Copper -- -- -- -- Down -- --
g39 1G-Copper -- -- -- -- Down -- --
g40 1G-Copper -- -- -- -- Down -- --
g41 1G-Copper Full 1000 Enabled Off Up Disabled Off
g42 1G-Copper Full 1000 Enabled Off Up Disabled On
g43 1G-Copper Full 1000 Enabled Off Up Disabled On
g44 1G-Copper Full 1000 Enabled Off Up Disabled Off
g45 1G-Combo-C -- -- -- -- Down -- --
g46 1G-Combo-C Full 1000 Enabled Off Up Disabled On
g47 1G-Combo-C -- -- -- -- Down -- --
g48 1G-Combo-C -- -- -- -- Down -- --
Flow Link
Ch Type Duplex Speed Neg control State
-------- ------- ------ ----- -------- ------- -----------
ch1 1G Full 1000 Enabled Off Up
ch2 -- -- -- -- -- Not Present
ch3 -- -- -- -- -- Not Present
ch4 -- -- -- -- -- Not Present
ch5 -- -- -- -- -- Not Present
ch6 -- -- -- -- -- Not Present
ch7 -- -- -- -- -- Not Present
ch8 -- -- -- -- -- Not Present
console#
joe.cruz
9 Posts
0
April 25th, 2008 15:00
I don't believe that's what I want. g1-4 are connected to hosts and shouldn't be part of the LAG.
bh1633
909 Posts
0
April 25th, 2008 15:00
Put some ports in port channel 1.
Did you post your whole config?
bh1633
909 Posts
0
April 25th, 2008 15:00
add ports g1-g4 to port channel 1.
bh1633
909 Posts
0
April 25th, 2008 15:00
Sorry about that. These Dell config files scatter the information. I sse that you have ports g41-g44 in port channel 1.
Please post out put of "show interface status" and "show spanning-tree" from both switches.
joe.cruz
9 Posts
0
April 25th, 2008 16:00
One thing I haven't mention before that is apparently important. g46 on Switch A is connected to our private management switch. g46 on Switch B is connected to g47 on Switch A. If I disabled g47 on Switch A, Ch1 goes right into STP Forwarding status.
If I then re-enable g47, this happens:
25-Apr-2008 13:01:33 %STP-W-PORTSTATUS: ch1: STP status Blocking
25-Apr-2008 13:01:33 %STP-W-PORTSTATUS: g46: STP status Forwarding
So I apparently can't have more than one span or something like that?
bh1633
909 Posts
0
April 25th, 2008 17:00
Like most switches, PowerConnects default to a singel spanning tree per switch. This means that even if ports are in seperate vlans, spanning tree will ignore the vlans and remove physical loops in the network, even if there are no loopsg in the individual vlans.
So, in your case, port 46 is in vlan 1 and port channel 1 is in vlan 1000. You interconnected the switches via the port channels AND via port 46. Spanning tree detected a loop, and disabled the port channel, even though there was no loop because port 46 and port channel 1 are in different vlans. Disabling the port channel removed vlan 1000 connectivity to the other switch.
If you need vlan 1 connectivity between these switches, I recommend adding vlan 1 to the port channel, making vlan 1000 tagged on the port channel and setting pvid on the port channel to 1. And then do not connect the switches together via port 46/47.
bh1633
909 Posts
0
April 25th, 2008 19:00
To be explicit (I am doing this from memory, but you should get the idea):
int port-channel 1
switchport mode general
switchport general pvid 1
switchport general allowed vlan add 1000 tagged
switchport general allowed vlan add 1 untagged
Do this on both switches.
joe.cruz
9 Posts
0
April 25th, 2008 19:00
Hi, BH. Thanks for the advice.
by way of a string of CLI commands:
int port-channel 1
switchport mode general
switchport general pvid 1
switchport general allowed vlan add 1000
Is that what you mean?
joe.cruz
9 Posts
0
April 28th, 2008 20:00
Hi, bh1633.
Thanks for all of your help. I ended up calling Dell Tech Support and they confirmed everything you said (as I suspected), but also opened up the option to use MSTP on these switches. This was it's possible to do a Spanning-tree per VLAN.
I'll see if that fits in with the topology we're trying to create, but I think given all of your advice and help, we're going to move ahead with what we have gotten to work now.
Thanks, again!
Joe