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New Member

Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

After moving 3750 my vlans and pvlans don't work. Pings go only to SVI in Vlan 1. Outside stack everything work ok. WhaT TO DO ?

10 REPLIES
Hall of Fame Super Silver

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

Hello Karol,

I guess that you have taken a stand-alone C3750 and you have put it in an existing stack.

In this case the rules for the addition of a new switch to a stack applies:

If the switch stack is running Cisco IOS Release 12.2(20)SE or later and does not contain a provisioned configuration for a new switch, the switch joins the stack with the default interface configuration. The switch stack then adds to its running configuration a switch stack-member-number provision type global configuration command that matches the new switch.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/configuration/guide/swstack.html#wp1178950

you need to rebuild the configuration of the switch on the master of the stack.

use sh switch to see what slot number has been assigned to the last added switch.

Use a backup copy of the old configuration to rebuild

Hope to help

Giuseppe

New Member

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

I used resetted switch (10 seconds pressing button) and added to stack. And after this restarted stack. After this I configured vlans and pvlans from beggining... I checked my vlan have all ports -->stack have all ports in vlan from all switches ! I think rebuild configuration switch is not necessary ! Because I do it from beggining on stack. COnfiguration worked only on one switch without stack which is strange. Maybe for stack i must do some things with STP or even VTP ? One switch works different than stack with vlans and pvlans ?

New Member

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

Switch#sh sp

VLAN0001

Spanning tree enabled protocol rstp

Root ID Priority 32768

Address 0014.bfb1.54d4

Cost 19

Port 155 (FastEthernet3/0/43)

Hello Time 2 sec Max Age 20 sec Forward Delay 1 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 0023.ac0f.1c80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

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

Gi4/0/1 Desg FWD 19 128.163 Edge P2p

Gi4/0/2 Desg FWD 19 128.164 P2p

Gi4/0/3 Desg FWD 19 128.165 P2p

Gi4/0/4 Desg FWD 4 128.166 P2p

Gi4/0/5 Desg FWD 19 128.167 P2p

Gi4/0/6 Desg FWD 4 128.168 P2p

Gi4/0/7 Desg FWD 100 128.169 P2p

Gi4/0/8 Desg FWD 4 128.170 P2p

Gi4/0/9 Desg FWD 19 128.171 P2p

Gi4/0/10 Desg FWD 4 128.172 P2p

Gi4/0/12 Desg FWD 4 128.174 P2p

Gi4/0/14 Desg FWD 19 128.176 P2p

Gi4/0/15 Desg FWD 19 128.177 P2p

Gi4/0/16 Desg FWD 19 128.178 P2p

Gi4/0/17 Desg FWD 19 128.179 P2p

Gi4/0/19 Desg FWD 19 128.181 P2p

Gi4/0/21 Desg FWD 19 128.183 P2p

Gi4/0/22 Desg FWD 19 128.184 P2p

Gi1/0/19 Desg FWD 19 128.19 P2p

Fa2/0/2 Desg FWD 19 128.58 P2p

Fa2/0/3 Desg FWD 19 128.59 P2p

Fa2/0/4 Desg FWD 19 128.60 P2p

Fa2/0/5 Desg FWD 19 128.61 P2p

Fa2/0/6 Desg FWD 19 128.62 P2p

Fa2/0/7 Desg FWD 19 128.63 P2p

Fa2/0/9 Desg FWD 19 128.65 P2p

Fa2/0/10 Desg FWD 19 128.66 P2p

Fa2/0/11 Desg FWD 19 128.67 P2p

Fa2/0/12 Desg FWD 19 128.68 P2p

Fa2/0/17 Desg FWD 19 128.73 Edge P2p

Fa2/0/20 Desg FWD 19 128.76 P2p

Fa2/0/21 Desg FWD 19 128.77 P2p

Fa2/0/22 Desg FWD 19 128.78 P2p

Fa2/0/23 Desg FWD 19 128.79 P2p

Fa2/0/24 Desg FWD 19 128.80 P2p

Fa2/0/25 Desg FWD 19 128.83 P2p

Fa2/0/26 Desg FWD 19 128.84 P2p

Fa2/0/27 Desg FWD 19 128.85 P2p

Fa2/0/28 Desg FWD 19 128.86 P2p

Fa2/0/30 Desg FWD 19 128.88 P2p

Fa2/0/31 Desg FWD 19 128.89 P2p

Fa2/0/32 Desg FWD 19 128.90 P2p

Fa2/0/33 Desg FWD 19 128.91 P2p

Fa2/0/34 Desg FWD 19 128.92 P2p

Fa2/0/35 Desg FWD 19 128.93 P2p

Fa2/0/36 Desg FWD 19 128.94 P2p

Fa2/0/37 Desg FWD 19 128.95 P2p

Fa2/0/39 Desg FWD 19 128.97 P2p

Fa2/0/43 Desg FWD 19 128.101 P2p

Fa3/0/3 Desg FWD 19 128.113 Edge P2p

Fa3/0/4 Desg FWD 19 128.114 P2p

Fa3/0/5 Desg FWD 19 128.115 P2p

Fa3/0/11 Desg FWD 100 128.121 Shr

Fa3/0/20 Desg FWD 19 128.130 P2p

Fa3/0/22 Desg FWD 19 128.132 P2p

Fa3/0/27 Desg FWD 19 128.139 P2p

Fa3/0/28 Desg FWD 19 128.140 P2p

Fa3/0/29 Desg FWD 19 128.141 P2p

Fa3/0/30 Desg FWD 100 128.142 Shr

Fa3/0/31 Desg FWD 19 128.143 P2p

Fa3/0/32 Desg FWD 19 128.144 P2p

Fa3/0/33 Desg FWD 19 128.145 P2p

Fa3/0/38 Desg FWD 19 128.150 P2p

Fa3/0/40 Desg FWD 19 128.152 P2p

New Member

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

Fa3/0/43 Root FWD 19 128.155 P2p Peer(STP)

Fa3/0/44 Desg FWD 19 128.156 P2p

Fa3/0/45 Desg FWD 19 128.157 P2p

Fa3/0/46 Desg FWD 19 128.158 P2p

Fa3/0/47 Desg FWD 19 128.159 P2p

Fa3/0/48 Desg FWD 19 128.160 P2p

VLAN0003

Spanning tree enabled protocol rstp

Root ID Priority 32771

Address 0023.ac0f.1c80

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32771 (priority 32768 sys-id-ext 3)

Address 0023.ac0f.1c80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

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

Fa3/0/48 Desg FWD 19 128.160 P2p

VLAN0033

Spanning tree enabled protocol rstp

Root ID Priority 32801

Address 0023.ac0f.1c80

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32801 (priority 32768 sys-id-ext 33)

Address 0023.ac0f.1c80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

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

Fa3/0/48 Desg FWD 19 128.160 P2p

VLAN0066

Spanning tree enabled protocol rstp

Root ID Priority 32834

Address 0023.ac0f.1c80

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32834 (priority 32768 sys-id-ext 66)

Address 0023.ac0f.1c80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

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

Fa3/0/48 Desg FWD 19 128.160 P2p

New Member

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

VLAN0077

Spanning tree enabled protocol rstp

Root ID Priority 32845

Address 0023.ac0f.1c80

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32845 (priority 32768 sys-id-ext 77)

Address 0023.ac0f.1c80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

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

Fa3/0/48 Desg FWD 19 128.160 P2p

VLAN0088

Spanning tree enabled protocol rstp

Root ID Priority 32856

Address 0023.ac0f.1c80

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32856 (priority 32768 sys-id-ext 88)

Address 0023.ac0f.1c80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

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

Fa3/0/48 Desg FWD 19 128.160 P2p

VLAN0099

Spanning tree enabled protocol rstp

Root ID Priority 32867

Address 0023.ac0f.1c80

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32867 (priority 32768 sys-id-ext 99)

Address 0023.ac0f.1c80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

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

Gi1/0/11 Desg FWD 19 128.11 P2p

Fa3/0/48 Desg FWD 19 128.160 P2p

Switch#

it seems that spanning tree is not active in newly inserted switch

Hall of Fame Super Silver

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

Hello Karol,

there is an attach file option that allows to place long txt show output in a single file.

From the show I can only guess this is a stack made of 4 switches because I see ports like 4/0/x.

Do you see the new switch in

show switch output ?

Until you don't see it there it is not part of the stack.

Get a console access to that switch and examine the log buffer with

sh log

it should tell why it hasn't joined the stack (if so )

And also do it on master switch

Hope to help

Giuseppe

New Member

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

maybe something is not good with routing ? on stack... I moved switch from stand alone where pings from vlans to vlan 1 works to stack and communication is only to SVI !!!

Files

show running

show switch

show log

Hall of Fame Super Silver

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

Hello Karol,

>> maybe something is not good with routing ?

routing is another question.

let me put the question more simply:

you have added a switch to a 4 switches stack or the stack was made of 3 switches and you have added the 4th one ?

Have you seen that from sh switch no specific priority is set so there are chances that master switch can change after a stack reboot ?

currently the master is switch n. 4:

Switch#sh sw

Switch/Stack Mac Address : 0023.ac0f.1c80

H/W Current

Switch# Role Mac Address Priority Version State

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

1 Member 0023.ac0f.3600 1 0 Ready

2 Member 0023.acb7.fd00 1 0 Ready

3 Member 0023.ace8.1680 1 0 Ready

>>>*4 Master 0023.ac0f.1c80 1 0 Ready

slot 4 has only an ISL trunk to something else all other ports are in vlan1.

if you issue

sh vlan

how many vlans do you see ?

if the last switch added has become master the result can be less then desirable.

Hope to help

Giuseppe

New Member

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

Switches are 4 ! G4 was always a master !

PVlans : 33 (secondary 66,77)

Vlans 1,88,99 (3 is deleted now)

Trunk is to D-Link , router (gateway is connected to vlan 1 on g4, only ethernet cable) The same configuration with the same switches cisco and dlink was working without the stack with all vlans !!! I always power on master first and power off last !

New Member

Re: Move 3750 to stack (4x3750)- VLANS AND PRIVATE VLANS

communication between vlans works (pings between computers work if computer is not in vlan 1 --> problem is with vlan 1 !!!)

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