03-02-2010 12:12 PM - edited 03-06-2019 09:57 AM
We have 2 core 6509 switches core1 and core2 that connected to each other over a port-channel1 made up of 6 ports (5/1-5/6). All Vlans are allowed on this etherchannel.
We also have a HP Interconnect switch connected to core1 and core2 on port 8/1 core1 and port 8/1 core2. For some reason all the network traffic is going from core1 to HP switch first and then go over to core2 via port 8/1. That how our traffic is going across the cores right now. We would like to have our network traffic going across the cores through the etherchannel.
6509 core1
vtp domain FP_VTP
vtp mode transparent
interface port-channel1
switchport
switchport trunk encap dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 1,100-107,999
switchport mode trunk
no ip address
When we do show spanning-tree root, Vlan0001 is going to root port gi8/1 which connected to HP switch.
What would be the best way to configure the 6509s to use etherchannel instead of gi8/1 between core1 and core2?
-Smith-
03-02-2010 12:20 PM
ssamaharn wrote:
We have 2 core 6509 switches core1 and core2 that connected to each other over a port-channel1 made up of 6 ports (5/1-5/6). All Vlans are allowed on this etherchannel.
We also have a HP Interconnect switch connected to core1 and core2 on port 8/1 core1 and port 8/1 core2. For some reason all the network traffic is going from core1 to HP switch first and then go over to core2 via port 8/1. That how our traffic is going across the cores right now. We would like to have our network traffic going across the cores through the etherchannel.
When we do show spanning-tree root, Vlan0001 is going to root port gi8/1 which connected to HP switch.
What would be the best way to configure the 6509s to use etherchannel instead of gi8/1 between core1 and core2?
-Smith-
Have you configured the 6500 switches to be the STP root and secondary for all the vlans. If youy haven't then the HP switches could be selected as root and secondary.
If you haven't you need to configure them but you will need an outage because there will be an STP recalculation.
Jon
03-02-2010 12:22 PM
Do you have one of the 6509s configured as root?
spanning-tree vlan
spanning-tree vlan
03-02-2010 12:53 PM
Thank you very much for a quick reply. How do I check on the core to see if I have the first core STP root for all vlans? I'm pretty sure I dont have that setup for sure.
-Smith-
03-02-2010 12:58 PM
on the device you want to be root:
sh spanning-tree vlan
see if the reported Root ID and Bridge ID match.
The Bridge ID is what that device thinks it is, and the Root ID is what it thinks the root bridge's ID is.
03-02-2010 12:58 PM
Pick a vlan and do "sh spanning-tree vlan
Also there would be lines in your config on the 6500 switches along the lines of
spanning-tree vlan root primary
spanning-tree vlan root secondary
or
spanning-tree vlan priority
Jon
03-02-2010 01:28 PM
show spanning-tree vlan 1
vlan0001
spanning tree enabled protocol ieee
Root ID Priority 32768
Address 0002.a5d1.275b
Cost 4
Port 897 (GigabitEthernet 8/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0019.07b5.6400
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
03-02-2010 01:32 PM
that device is not the root bridge.
the root bridge is one of the HP devices (0002.a5 is an HP MAC address), probably by virtue of its lower MAC address.
Set the device to be root and you should see the traffic passing correctly
03-02-2010 01:34 PM
ssamaharn wrote:
show spanning-tree vlan 1
vlan0001
spanning tree enabled protocol ieee
Root ID Priority 32768
Address 0002.a5d1.275b
Cost 4
Port 897 (GigabitEthernet 8/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0019.07b5.6400
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
From the above -
Root ID Priority 32768
Address 0002.a5d1.275b
the above is the root bridge. From the mac-address 0002.a5 is HP.
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0019.07b5.6400
this is mac-address of the 6500.
When you are on the root switch the 2 mac-addresses will match.
Jon
03-02-2010 01:31 PM
03-02-2010 01:33 PM
Spanning tree convergence should only take a couple of minutes
03-03-2010 01:11 PM
I've been reading about portfast BPDU guard. What would be the best practice for two 6509s to talk to each over an etherchannel?
I have the show spanning-tree root, show spanning-tree summary and show config on one of the core 6509s.
show spanning-tree root
vlan Root ID Root Hello Max Fwd Root Port
________________________________Cost_______________________
vlan0001 32768 0002.a5d1.275b 4 2 20 15 gi8/1
vlan0100 32686 0019.07b5.6400 0 2 20 15
vlan0101 32869 0019.07b5.6400 0 2 20 15
vlan0102 32870 0019.07b5.6400 0 2 20 15
vlan0103 32871 0019.07b5.6400 0 2 20 15
vlan0104 32872 0019.07b5.6400 0 2 20 15
vlan0105 32873 0019.07b5.6400 0 2 20 15
vlan0106 32874 0019.07b5.6400 0 2 20 15
vlan0107 32875 0019.07b5.6400 0 2 20 15
vlan0109 32877 0019.07b5.6400 0 2 20 15
vlan0111 32879 0019.07b5.6400 0 2 20 15
vlan0200 32769 001e.1477.e200 19 2 20 15 gi8/24
vlan0999 33767 0019.07b5.6400 0 2 20 15
03-03-2010 01:14 PM
ssamaharn wrote:
I've been reading about portfast BPDU guard. What would be the best practice for two 6509s to talk to each over an etherchannel?
I have the show spanning-tree root, show spanning-tree summary and show config on one of the core 6509s.
Not sure how this relates to your original question. Is this now a different question ? BPDUGuard will do nothing to help you with your original problem.
Jon
03-03-2010 01:18 PM
Hi, Jon
It's the same question. I was just reading about the BDPU guard on Cisco site yesterday about helping with spanning-tree.
03-03-2010 01:21 PM
ssamaharn wrote:
Hi, Jon
It's the same question. I was just reading about the BDPU guard on Cisco site yesterday about helping with spanning-tree.
BPDUGuard is used for ports that should not receive BPDUs on them ie. ports connected to devices such as client PCs/servers etc. It is no use for connections between switches because you want BPDUs to be sent and received on these ports.
Are you sure you are not thinking of rootguard which would help in making sure that your HP switches could not become the root switches ? You still need to sort out the STP root and secondary on your 6500 switches.
Jon
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