VTP Question
iproute
Member Posts: 269
in CCNA & CCENT
I have two 2912 XL switches and I simply can't get VTP to replicate vlan info from one switch to another. I can't figure out what I'm doing wrong. Any help would be appreciated.
I've set one switch to VTP client (SW_B) and one to VTP server (SW_A). I've set the VTP domain and VTP domain password (optional, I know). The two switches are connected to each other via a cross-over cable on FA0/8 (both switches). A router isn't required, is it?
Here's the config and relevant info:
SW-A: SHOW RUN
SW-A Other:
SW-B: SHOW RUN
SW-B Other:
Am I confused about what VTP does?
1,000,000 apologizes if this is something dumb and simply overlooked.
I've set one switch to VTP client (SW_B) and one to VTP server (SW_A). I've set the VTP domain and VTP domain password (optional, I know). The two switches are connected to each other via a cross-over cable on FA0/8 (both switches). A router isn't required, is it?
Here's the config and relevant info:
SW-A: SHOW RUN
! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname Switch_A ! enable secret 5 XXX ! ! ! ! ! ! ip subnet-zero no ip domain-lookup ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 switchport trunk encapsulation dot1q ! interface FastEthernet0/9 switchport access vlan 2 ! interface FastEthernet0/10 switchport access vlan 2 ! interface FastEthernet0/11 switchport access vlan 2 ! interface FastEthernet0/12 switchport access vlan 2 ! interface VLAN1 ip address 10.7.82.251 255.255.255.0 no ip directed-broadcast no ip route-cache ! ! line con 0 password 7 XXX login transport input none stopbits 1 line vty 0 4 password 7 XXX login line vty 5 15 password 7 XXX login ! end
SW-A Other:
Switch_A#show vtp status
VTP Version : 2
Configuration Revision : 9
Maximum VLANs supported locally : 68
Number of existing VLANs : 6
VTP Operating Mode : Server
VTP Domain Name : stuff
VTP Pruning Mode : Disabled
VTP V2 Mode : Enabled
VTP Traps Generation : Disabled
MD5 digest : 0x16 0xFF 0x63 0x8E 0x7D 0xD4 0x55 0x74
Configuration last modified by 10.7.82.251 at 3-1-93 02:39:51
Switch_A#show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4,
Fa0/5, Fa0/6, Fa0/7, Fa0/8
2 VLAN0002 active Fa0/9, Fa0/10, Fa0/11, Fa0/12
1002 fddi-default active
1003 trcrf-default active
1004 fddinet-default active
1005 trbrf-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
2 enet 100002 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 trcrf 101003 4472 1005 3276 - - srb 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trbrf 101005 4472 - - 15 ibm - 0 0
VLAN AREHops STEHops Backup CRF
---- ------- ------- ----------
1003 7 7 off
SW-B: SHOW RUN
! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname Switch_B ! enable secret 5 XXX ! ! ! ! ! ! ip subnet-zero no ip domain-lookup ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 switchport trunk encapsulation dot1q ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface VLAN1 ip address 10.7.82.252 255.255.255.0 no ip directed-broadcast no ip route-cache ! ! line con 0 password 7 XXX login transport input none stopbits 1 line vty 0 4 password 7 XXX login line vty 5 15 password 7 XXX login ! end
SW-B Other:
Switch_B#show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 68
Number of existing VLANs : 5
VTP Operating Mode : Client
VTP Domain Name : stuff
VTP Pruning Mode : Disabled
VTP V2 Mode : Enabled
VTP Traps Generation : Disabled
MD5 digest : 0x03 0x4F 0xD8 0xA5 0x68 0xF2 0xC8 0xE8
Configuration last modified by 10.7.82.252 at 3-1-93 01:03:39
Switch_B#show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4,
Fa0/5, Fa0/6, Fa0/7, Fa0/8,
Fa0/9, Fa0/10, Fa0/11, Fa0/12
1002 fddi-default active
1003 trcrf-default active
1004 fddinet-default active
1005 trbrf-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 trcrf 101003 4472 1005 3276 - - srb 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trbrf 101005 4472 - - 15 ibm - 0 0
VLAN AREHops STEHops Backup CRF
---- ------- ------- ----------
1003 7 7 off
Am I confused about what VTP does?
1,000,000 apologizes if this is something dumb and simply overlooked.
CCNP Progress
ROUTE [X] :: SWITCH [X] :: TSHOOT [X]
ROUTE [X] :: SWITCH [X] :: TSHOOT [X]
Comments
-
mikej412
Member Posts: 10,086 ■■■■■■■■■■
iproute wrote:I've set the VTP domain and VTP domain password (optional, I know).Switch_A#show vtp status MD5 digest : 0x16 0xFF 0x63 0x8E 0x7D 0xD4 0x55 0x74
Switch_B#show vtp status MD5 digest : 0x03 0x4F 0xD8 0xA5 0x68 0xF2 0xC8 0xE8
If you had the same password on each switch, shouldn't the MD5 hashes should be the same?:mike: Cisco Certifications -- Collect the Entire Set! -
iproute
Member Posts: 269
mikej412 wrote:iproute wrote:I've set the VTP domain and VTP domain password (optional, I know).
Switch_A#show vtp status MD5 digest : 0x16 0xFF 0x63 0x8E 0x7D 0xD4 0x55 0x74
Switch_B#show vtp status MD5 digest : 0x03 0x4F 0xD8 0xA5 0x68 0xF2 0xC8 0xE8
If you had the same password on each switch, shouldn't the MD5 hashes should be the same?
Perhaps, but see below. I'm not 100% sure.
CCNP Progress
ROUTE [X] :: SWITCH [X] :: TSHOOT [X] -
mwgood
Member Posts: 293
It might be that you have not yet enabled trunking.
Try switchport mode trunk on both switches for your trunk link. -
mwgood
Member Posts: 293
iproute wrote:Both switches have trunking enabled on int fa0/8.
Not according to the output in your show vlan brief commands. What you posted for the results for that command indicates that the fa0/8 ports are access ports in vlan 1.
"switchport trunk encapsulation dot1q" is the only command on fa0/8 that you list in your config - which is not sufficient to turn on trunking.
Please try a "show int status" to verify trunking. -
mikej412
Member Posts: 10,086 ■■■■■■■■■■
In your original post you have the trunking encapsulation set..... and that's it. The 2912's probably predate DTP (Dynamic Trunking Protocol) so you have to manually tell the port to be a trunk with the switchport mode trunk command.iproute wrote:
Both switches have trunking enabled on int fa0/8.mwgood wrote:It might be that you have not yet enabled trunking.
Try switchport mode trunk on both switches for your trunk link.
Darby's sample used isl encapsulation (and the range command which you don't have). And as Darby showed -- use the show interfaces trunk command to verify the establishment of the trunk.DarbyWeaver wrote:switchport trunk encap isl
switchport mode trunk
sh int trunk:mike: Cisco Certifications -- Collect the Entire Set! -
iproute
Member Posts: 269
Alas, the problem is discovered. I would have swore up and down a few minutes ago that the "switchport mode trunk" command didn't work on these switches. I was under the assumption that enabling trunk encapsulation automatically enabled trunking. Anyway, output of show int status:
Switch_A#show int status Port Name Status Vlan Duplex Speed Type ------- ------------------ ------------ -------- ------ ------- ---- Fa0/1 connected 1 A-Full A-100 100BaseTX/FX Fa0/2 connected 1 A-Full A-100 100BaseTX/FX Fa0/3 notconnect 1 Auto Auto 100BaseTX/FX Fa0/4 notconnect 1 Auto Auto 100BaseTX/FX Fa0/5 notconnect 1 Auto Auto 100BaseTX/FX Fa0/6 notconnect 1 Auto Auto 100BaseTX/FX Fa0/7 notconnect 1 Auto Auto 100BaseTX/FX Fa0/8 connected trunk A-Full A-100 100BaseTX/FX Fa0/9 notconnect 2 Auto Auto 100BaseTX/FX Fa0/10 notconnect 2 Auto Auto 100BaseTX/FX Fa0/11 notconnect 2 Auto Auto 100BaseTX/FX Fa0/12 notconnect 2 Auto Auto 100BaseTX/FX Switch_B#show int status Port Name Status Vlan Duplex Speed Type ------- ------------------ ------------ -------- ------ ------- ---- Fa0/1 connected 1 A-Half A-10 100BaseTX/FX Fa0/2 connected 1 A-Half A-10 100BaseTX/FX Fa0/3 notconnect 1 Auto Auto 100BaseTX/FX Fa0/4 notconnect 1 Auto Auto 100BaseTX/FX Fa0/5 notconnect 1 Auto Auto 100BaseTX/FX Fa0/6 notconnect 1 Auto Auto 100BaseTX/FX Fa0/7 notconnect 1 Auto Auto 100BaseTX/FX Fa0/8 connected trunk A-Full A-100 100BaseTX/FX Fa0/9 notconnect 1 Auto Auto 100BaseTX/FX Fa0/10 notconnect 1 Auto Auto 100BaseTX/FX Fa0/11 notconnect 1 Auto Auto 100BaseTX/FX Fa0/12 notconnect 1 Auto Auto 100BaseTX/FX
VTP is now working! Note that VLAN0002 now exists on switch-b as well.Switch_A#show vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4, Fa0/5, Fa0/6, Fa0/7 2 VLAN0002 active Fa0/9, Fa0/10, Fa0/11, Fa0/12 Switch_B#show vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4, Fa0/5, Fa0/6, Fa0/7, Fa0/9, Fa0/10, Fa0/11, Fa0/12 2 VLAN0002 active
Thanks for the help guys; it's much appreciated!CCNP Progress
ROUTE [X] :: SWITCH [X] :: TSHOOT [X] -
mwgood
Member Posts: 293
Excellent.
Notice that fa0/8 no longer appears in your show vlan output. When a port becomes a trunk - it is no longer assigned to a vlan, so it is an indication that trunking has been turned on when it disappears from the sh vlan brief output. It follows that if the port IS listed, then it's NOT a trunk.
Also - show int status is a very useful command to get a quick overview of your switch ports. -
Paul Boz
Member Posts: 2,620 ■■■■■■■■□□
#show interface trunk
is another good "show" command for learning about switchport status.CCNP | CCIP | CCDP | CCNA, CCDA
CCNA Security | GSEC |GCFW | GCIH | GCIA
pbosworth@gmail.com
http://twitter.com/paul_bosworth
Blog: http://www.infosiege.net/ -
iproute
Member Posts: 269
Show Int Status is actually a command that I hadn't used prior to this exercise
Thanks for helping out with that.
Show Int Trunk doesn't work on the 2912-XL-EN, unless I'm typoing again heh. I did VPN into work to test it on my 2950's there, where it worked.
Thanks for all the help.CCNP Progress
ROUTE [X] :: SWITCH [X] :: TSHOOT [X] -
Netstudent
Member Posts: 1,693 ■■■□□□□□□□
wow, what an informational thread.There is no place like 127.0.0.1 BUT 209.62.5.3 is my 127.0.0.1 away from 127.0.0.1! -
markzab
Member Posts: 619
"You, me, or nobody is gonna hit as hard as life. But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward. How much you can take, and keep moving forward. That's how winning is done!" - Rocky
