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Stacking 3760 catalyst with 2960 catalyst.

daniel espinal
Level 1
Level 1

There are 2 3760g catalyst stacked using 2 StackWise cables.

Then the 2960s are stacked using 4 ports as etherchannels.

The switches work fine. Now where I’m having a problem is I want to set up a second etherchannel between the 3760s and the 2960s. I tried using the same config but when I do a show etherchannel summary I see the channel is down.

Any ideas? 

here is a diagram

 

Here are the configs

SWITCH 1

!
! Last configuration change at 04:50:01 UTC Tue Mar 16 1993
!
version 15.0
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Switch1
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
switch 1 provision ws-c3750g-48ps
switch 2 provision ws-c3750g-48ps
system mtu routing 1500
no ip domain-lookup
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree vlan 1 priority 24576
!
vlan internal allocation policy ascending
!
ip ssh version 2
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Port-channel2
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface range GigabitEthernet1/0/1-48 , 2/0/1-44
 switchport mode access
 spanning-tree portfast
!
!
interface GigabitEthernet2/0/45
 switchport trunk encapsulation dot1q
 switchport mode trunk
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 2 mode active
!
interface GigabitEthernet2/0/46
 switchport trunk encapsulation dot1q
 switchport mode trunk
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 2 mode active
!
interface GigabitEthernet2/0/47
 switchport trunk encapsulation dot1q
 switchport mode trunk
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 2 mode active
!
interface GigabitEthernet2/0/48
 switchport trunk encapsulation dot1q
 switchport mode trunk
 speed 1000
 duplex full
!
!
interface Vlan1
 ip address 192.168.5.2 255.255.255.0
!
ip http server
ip http secure-server
!
!
!
!
!
!
line con 0
 logging synchronous
line vty 0 4
 no login
 transport input ssh
line vty 5 15
 no login
!
end
 

Switch 3

!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Switch3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
system mtu routing 1500
ip subnet-zero
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
interface Port-channel1
 switchport mode trunk
!
interface Port-channel2
 switchport mode trunk
!
interface range GigabitEthernet0/1-41
 switchport mode access
 spanning-tree portfast
!
!
interface GigabitEthernet0/42
 switchport mode trunk
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 2 mode active
!
interface GigabitEthernet0/43
 switchport mode trunk
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 2 mode active
!
interface GigabitEthernet0/44
 switchport mode trunk
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 2 mode active
!
interface GigabitEthernet0/45
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface GigabitEthernet0/46
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface GigabitEthernet0/47
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface GigabitEthernet0/48
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface Vlan1
 ip address 192.168.5.3 255.255.255.0
 no ip route-cache
!
ip http server
ip http secure-server
!
control-plane
!
!
line con 0
 logging synchronous
line vty 0 4
 no login
line vty 5 15
 no login
!
end

Switch 4

!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Switch4
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
system mtu routing 1500
ip subnet-zero
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
interface Port-channel1
 switchport mode trunk
!
interface Port-channel2
!
interface range GigabitEthernet0/1-44
 switchport mode access
 spanning-tree portfast
!
interface GigabitEthernet0/45
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface GigabitEthernet0/46
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface GigabitEthernet0/47
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface GigabitEthernet0/48
 switchport mode trunk
 channel-protocol lacp
 channel-group 1 mode active
!
interface Vlan1
 ip address 192.168.5.4 255.255.255.0
 no ip route-cache
!
no ip http server
no ip http secure-server
!
control-plane
!
!
line con 0
 logging synchronous
line vty 0 4
 no login
line vty 5 15
 no login
!
end
 

Here is a show ethercahnnel detail

Switch3#show etherchannel detail

Channel-group listing:

----------------------

 

Group: 1

----------

Group state = L2

Ports: 4 Maxports = 16

Port-channels: 1 Max Port-channels = 16

Protocol: LACP

Minimum Links: 0

Ports in the group:

-------------------

Port: Gi0/45

------------

 

Port state = Up Mstr Assoc In-Bndl

Channel group = 1 Mode = Active Gcchange = -

Port-channel = Po1 GC = - Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi0/45 SA bndl 32768 0x1 0x1 0x2D 0x3D

 

Partner's information:

 

LACP port Admin Oper Port Port

Port Flags Priority Dev ID Age key Key Number State

Gi0/45 SA 32768 ec44.767f.ef80 20s 0x0 0x1 0x2D 0x3D

 

Age of the port in the current state: 0d:03h:05m:57s

 

Port: Gi0/46

------------

 

Port state = Up Mstr Assoc In-Bndl

Channel group = 1 Mode = Active Gcchange = -

Port-channel = Po1 GC = - Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi0/46 SA bndl 32768 0x1 0x1 0x2E 0x3D

 

Partner's information:

 

LACP port Admin Oper Port Port

Port Flags Priority Dev ID Age key Key Number State

Gi0/46 SA 32768 ec44.767f.ef80 6s 0x0 0x1 0x2E 0x3D

 

Age of the port in the current state: 0d:03h:05m:53s

 

Port: Gi0/47

------------

 

Port state = Up Mstr Assoc In-Bndl

Channel group = 1 Mode = Active Gcchange = -

Port-channel = Po1 GC = - Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi0/47 SA bndl 32768 0x1 0x1 0x2F 0x3D

 

Partner's information:

 

LACP port Admin Oper Port Port

Port Flags Priority Dev ID Age key Key Number State

Gi0/47 SA 32768 ec44.767f.ef80 24s 0x0 0x1 0x2F 0x3D

 

Age of the port in the current state: 0d:03h:05m:54s

 

Port: Gi0/48

------------

 

Port state = Up Mstr Assoc In-Bndl

Channel group = 1 Mode = Active Gcchange = -

Port-channel = Po1 GC = - Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi0/48 SA bndl 32768 0x1 0x1 0x30 0x3D

 

Partner's information:

 

LACP port Admin Oper Port Port

Port Flags Priority Dev ID Age key Key Number State

Gi0/48 SA 32768 ec44.767f.ef80 20s 0x0 0x1 0x30 0x3D

 

Age of the port in the current state: 0d:03h:05m:47s

 

Port-channels in the group:

---------------------------

 

Port-channel: Po1 (Primary Aggregator)

 

------------

 

Age of the Port-channel = 0d:03h:29m:41s

Logical slot/port = 2/1 Number of ports = 4

HotStandBy port = null

Port state = Port-channel Ag-Inuse

Protocol = LACP

Port security = Disabled

 

Ports in the Port-channel:

 

Index Load Port EC state No of bits

------+------+------+------------------+-----------

0 00 Gi0/45 Active 0

0 00 Gi0/46 Active 0

0 00 Gi0/47 Active 0

0 00 Gi0/48 Active 0

 

Time since last port bundled: 0d:03h:05m:49s Gi0/48

 

Group: 2

----------

Group state = L2

Ports: 3 Maxports = 16

Port-channels: 1 Max Port-channels = 16

Protocol: LACP

Minimum Links: 0

Ports in the group:

-------------------

Port: Gi0/42

------------

 

Port state = Down Not-in-Bndl

Channel group = 2 Mode = Active Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po2

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi0/42 SA down 32768 0x2 0x0 0x2A 0x45

 

Age of the port in the current state: 15d:06h:21m:09s

 

Port: Gi0/43

------------

 

Port state = Down Not-in-Bndl

Channel group = 2 Mode = Active Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po2

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi0/43 SA down 32768 0x2 0x0 0x2B 0x45

 

Age of the port in the current state: 15d:06h:21m:10s

 

Port: Gi0/44

------------

 

Port state = Down Not-in-Bndl

Channel group = 2 Mode = Active Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po2

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi0/44 SA down 32768 0x2 0x0 0x2C 0x45

 

Age of the port in the current state: 15d:06h:21m:11s

 

Port-channels in the group:

---------------------------

 

Port-channel: Po2 (Primary Aggregator)

 

------------

 

Age of the Port-channel = 0d:02h:38m:35s

Logical slot/port = 2/2 Number of ports = 0

HotStandBy port = null

Port state = Port-channel Ag-Not-Inuse

Protocol = LACP

Port security = Disabled

 

Switch1#show etherchannel summary

 

Flags: D - down P - bundled in port-channel

I - stand-alone s - suspended

H - Hot-standby (LACP only)

R - Layer3 S - Layer2

U - in use f - failed to allocate aggregator

 

M - not in use, minimum links not met

u - unsuitable for bundling

w - waiting to be aggregated

d - default port

 

 

Number of channel-groups in use: 1

Number of aggregators: 1

 

Group Port-channel Protocol Ports

------+-------------+-----------+-----------------------------------------------

2 Po2(SD) LACP Gi2/0/45(I) Gi2/0/46(D) Gi2/0/47(D)

 

 

Channel-group listing:

----------------------

 

Group: 2

----------

Group state = L2

Ports: 3 Maxports = 16

Port-channels: 1 Max Port-channels = 16

Protocol: LACP

Minimum Links: 0

Ports in the group:

-------------------

Port: Gi2/0/45

------------

 

Port state = Up Sngl-port-Bndl Mstr Not-in-Bndl

Channel group = 2 Mode = Active Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po2

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi2/0/45 SA indep 32768 0x2 0x2 0x22E 0x7D

 

Age of the port in the current state: 0d:00h:02m:51s

 

Port: Gi2/0/46

------------

 

Port state = Down Not-in-Bndl

Channel group = 2 Mode = Active Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po2

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi2/0/46 SA down 32768 0x2 0x0 0x22F 0x45

 

--More--

*Mar 16 05:07:51.105: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/11, changed state to down

*Mar 16 05:07:53.109: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/11, changed sAge of the port in the current state: 0d:02h:36m:23s

 

Port: Gi2/0/47

------------

 

Port state = Down Not-in-Bndl

Channel group = 2 Mode = Active Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po2

Port index = 0 Load = 0x00 Protocol = LACP

 

Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.

A - Device is in active mode. P - Device is in passive mode.

 

Local information:

LACP port Admin Oper Port Port

Port Flags State Priority Key Key Number State

Gi2/0/47 SA down 32768 0x2 0x0 0x230 0x45

 

Age of the port in the current state: 0d:02h:36m:23s

 

Port-channels in the group:

---------------------------

 

Port-channel: Po2 (Primary Aggregator)

 

------------

 

Age of the Port-channel = 15d:00h:03m:40s

Logical slot/port = 10/2 Number of ports = 0

HotStandBy port = null

Port state = Port-channel Ag-Not-Inuse

Protocol = LACP

Port security = Disabled

 

2 Replies 2

devils_advocate
Level 7
Level 7

Is there a reason you have hard coded the speed and duplex on the physical ports within Channel Group 2?

Presumably the ports are in a down down state?

I would remove the speed 1000 and duplex full and leave the ports to autonegotiate.

Sounds to me like the ports are not coming up at a layer 1/2 level which is why they are not being bundled into the channel group. 

I will try it next time I'm on site but the reason I did that is because everything I've read about setting up infrastructure in general says links need to be hardcoded when it comes to infrastructure. The book "Network warrior" has a little story and warning about auto-negotiated links. In fact in the place I am currently working at we had an issue with our main WAN link going down. Turns out hard coding the link fixed the issue. The problem with auto negotiate is that when it fails it fails over to half duplex and the lowest possible speed. 

 

But at this point I'll try anything. Someone else told me to take out the channel-group protocol command and just use channel-group mode on for both sides. This manually creates the links instead of using one of the 2 link protocols to handle everything. 

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