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9.1

vlan flapping between trunk port and etherchannel

Asked by node_runner in Network Switches & Hubs, Network Operations, Network Design & Methodology

Tags: cisco, catalyst, 3560

I have two catalyst 3560 switches. they are connected via a single trunk port using 082.11q on gi0/23 on each switch.

I'm trying to set up an internal switch infrastructure, such that each of my linux servers are connected to both switches, using etherchannel on the switch, and bonding on the linux host.

For the most part I have this working. say I have "server x" with eth1 and eth0, connected to gi0/1 on both switches. I've configured each port on each switch using "channel-group 1 mode on" and made sure port 1 on each switch is on the same vlan and that the resulting po1 is on the right vlan.

Things usually work fine. I can physically disconnect one interface on the server and still have connectivity. However, I am having intermittent connectivity issues on all the servers.

My switch logs show these for all of my poX groups for my servers on an intermittent basis:
Host (mac srubbed) in vlan 1 is flapping between port Gi0/23 and port Po10

Keep in mind that gi0/23 is my trunk port between the two switches. I don't really understand what the problem is because the logical port info for each poX seems to be passing over the trunk interface and things seem to work most of the time. I've looked this up all over the web and I've tried a few different things:

1) I've tried configured gi0/23 on each switch with "spanning-tree bpdufilter enable". Toggling this on and off doesn't seem to help any.

2) I've tried configuring gi0/23 on each switch with "l2protocol-tunnel point-to-point" and this doesn't seem to help either.

Each time, I can re-create the flapping log entry just be sending traffic to any one of those servers and I'll get that error. The odd thing is that most of the time, the traffic still makes it to and from the host. Only about 20% of time do connections actually get dropped.

I'm using the default bonding method (round-robin) on each host, but I've also tried configuring one of the hosts to use active/standby mode for the bonding option and that didn't seem to help either.

Any ideas?

Running config for both switches:

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===============BEGIN SW2==========================
Current configuration : 2623 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname sw2
!
enable secret 5 xxxxxxxxxxx
enable password xxxxxxxxxxxxx
!
no aaa new-model
system mtu routing 1500
ip subnet-zero
ip name-server 10.1.5.1
ip name-server 10.1.5.2
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface Port-channel1
!
interface Port-channel2
!
interface Port-channel3
 switchport access vlan 2
!
interface Port-channel4
 switchport access vlan 2
!
interface Port-channel5
!
interface Port-channel6
!
interface Port-channel7
 switchport access vlan 2
!
interface Port-channel8
!
interface Port-channel9
 switchport access vlan 2
!
interface Port-channel10
!
interface GigabitEthernet0/1
 channel-group 1 mode on
!
interface GigabitEthernet0/2
 channel-group 2 mode on
!
interface GigabitEthernet0/3
 switchport access vlan 2
 channel-group 3 mode on
!
interface GigabitEthernet0/4
 switchport access vlan 2
 channel-group 4 mode on
!
interface GigabitEthernet0/5
 channel-group 5 mode on
!
interface GigabitEthernet0/6
 channel-group 6 mode on
!
interface GigabitEthernet0/7
 switchport access vlan 2
 channel-group 7 mode on
!
interface GigabitEthernet0/8
 channel-group 8 mode on
!
interface GigabitEthernet0/9
 switchport access vlan 2
 channel-group 9 mode on
!
interface GigabitEthernet0/10
 channel-group 10 mode on
!
interface GigabitEthernet0/11
!
interface GigabitEthernet0/12
!
interface GigabitEthernet0/13
!
interface GigabitEthernet0/14
!
interface GigabitEthernet0/15
!
interface GigabitEthernet0/16
!
interface GigabitEthernet0/17
!
interface GigabitEthernet0/18
!
interface GigabitEthernet0/19
!
interface GigabitEthernet0/20
!
interface GigabitEthernet0/21
!
interface GigabitEthernet0/22
!
interface GigabitEthernet0/23
 switchport trunk encapsulation dot1q
 switchport mode trunk
 l2protocol-tunnel point-to-point pagp
 
 l2protocol-tunnel point-to-point lacp
 l2protocol-tunnel point-to-point udld
 spanning-tree bpdufilter disable
!
interface GigabitEthernet0/24
!
interface GigabitEthernet0/25
!
interface GigabitEthernet0/26
!
interface GigabitEthernet0/27
!
interface GigabitEthernet0/28
!
interface Vlan1
 ip address 10.1.4.2 255.255.0.0
!
interface Vlan2
 ip address 10.1.4.2 255.255.0.0
 shutdown
!
ip default-gateway 10.1.5.1
ip classless
ip http server
!
logging 10.1.3.1
snmp-server community xxxxxxx RO
!
control-plane
!
!
line con 0
 exec-timeout 0 0
line vty 0 4
 password xxxxxxx
 login
line vty 5 15
 password xxxxxxxx
 login
!
end
========================================
 
 
==========BEGIN SW1===================
Current configuration : 2468 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname sw1
!
enable secret 5 xxxxxxxx
enable password xxxxxxxxxx
!
no aaa new-model
system mtu routing 1500
ip subnet-zero
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface Port-channel1
!
interface Port-channel2
!
interface Port-channel3
 switchport access vlan 2
!
interface Port-channel4
 switchport access vlan 2
!
interface Port-channel5
!
interface Port-channel6
!
interface Port-channel7
 switchport access vlan 2
!
interface Port-channel8
!
interface Port-channel9
 switchport access vlan 2
!
interface Port-channel10
!
interface GigabitEthernet0/1
 channel-group 1 mode on
!
interface GigabitEthernet0/2
 channel-group 2 mode on
!
interface GigabitEthernet0/3
 switchport access vlan 2
 channel-group 3 mode on
!
interface GigabitEthernet0/4
 switchport access vlan 2
 channel-group 4 mode on
!
interface GigabitEthernet0/5
 channel-group 5 mode on
!
interface GigabitEthernet0/6
 channel-group 6 mode on
!
interface GigabitEthernet0/7
 switchport access vlan 2
 channel-group 7 mode on
!
interface GigabitEthernet0/8
 channel-group 8 mode on
!
interface GigabitEthernet0/9
 switchport access vlan 2
 channel-group 9 mode on
!
interface GigabitEthernet0/10
 channel-group 10 mode on
!
interface GigabitEthernet0/11
!
interface GigabitEthernet0/12
!
interface GigabitEthernet0/13
!
interface GigabitEthernet0/14
!
interface GigabitEthernet0/15
!
interface GigabitEthernet0/16
!
interface GigabitEthernet0/17
!
interface GigabitEthernet0/18
!
interface GigabitEthernet0/19
!
interface GigabitEthernet0/20
!
interface GigabitEthernet0/21
!
interface GigabitEthernet0/22
!
interface GigabitEthernet0/23
 switchport trunk encapsulation dot1q
 switchport mode trunk
 l2protocol-tunnel point-to-point pagp
 l2protocol-tunnel point-to-point lacp
 l2protocol-tunnel point-to-point udld
 spanning-tree bpdufilter disable
!
interface GigabitEthernet0/24
!
interface GigabitEthernet0/25
!
interface GigabitEthernet0/26
!
interface GigabitEthernet0/27
!
interface GigabitEthernet0/28
!
interface Vlan1
 ip address 10.1.4.1 255.255.0.0
!
ip classless
ip http server
!
logging 10.1.3.1
snmp-server community xxxxxx RO
!
control-plane
!
!
line con 0
line vty 0 4
 password x
 login
line vty 5 15
 password x
 login
!
end
 
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Zones: Network Switches & Hubs, Network Operations, Network Design & Methodology
Tags: cisco, catalyst, 3560
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Solution Provided By: donjohnston
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