Cat1#sh interfaces trunk Port Mode Encapsulation Status Native vlan Fa0/23 on 802.1q trunking 1 Port Vlans allowed on trunk Fa0/23 2-4094 Port Vlans allowed and active in management domain Fa0/23 2,80 Port Vlans in spanning tree forwarding state and not pruned Fa0/23 2,80
Cat1#sh run int fa0/23 ! interface FastEthernet0/23 switchport trunk encapsulation dot1q switchport trunk allowed vlan 2-4094 switchport mode trunk switchport nonegotiate end Cat1#sh cdp neigh fa0/23 Device ID Local Intrfce Holdtme Capability Platform Port ID Cat2 Fas 0/23 167 S I WS-C3560- Fas 0/23 Cat2(config-if-range)#do sh int trunk Port Mode Encapsulation Status Native vlan Fa0/23 on 802.1q trunking 1 Port Vlans allowed on trunk Fa0/23 2-4094 Port Vlans allowed and active in management domain Fa0/23 2,80 Port Vlans in spanning tree forwarding state and not pruned Fa0/23 2,80 Cat2(config-if-range)#do sh run int fa0/23 ! interface FastEthernet0/23 switchport trunk encapsulation dot1q switchport trunk allowed vlan 2-4094 switchport mode trunk switchport nonegotiate end Cat2(config-if-range)#do sh cdp neigh fa0/23 Device ID Local Intrfce Holdtme Capability Platform Port ID Cat1 Fas 0/23 164 S I WS-C3560- Fas 0/23 ----!!HOWEVER!!---- Cat2(config-if-range)#do sh span VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 001a.6de2.4700 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 001a.6de2.4700 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec Interface Role Sts Cost Prio.Nbr Type ------------------- ---- --- --------- -------- -------------------------------- Fa0/7 Desg FWD 19 128.9 P2p Fa0/8 Desg FWD 19 128.10 P2p Fa0/9 Desg FWD 19 128.11 P2p ----!!BUT!!---- VTP is propigated CAT 1 CLIENT Cat1(config)#do sh vtp status VTP Version capable : 1 to 3 VTP version running : 1 VTP Domain Name : TEST VTP Pruning Mode : Disabled VTP Traps Generation : Disabled Device ID : 0018.734e.bc80 Configuration last modified by 2.2.2.2 at 3-1-93 01:31:09 Feature VLAN: -------------- VTP Operating Mode : Client Maximum VLANs supported locally : 1005 Number of existing VLANs : 9 Configuration Revision : 3 MD5 digest : 0x97 0xD7 0x50 0x1F 0x0F 0x77 0x7E 0x3A 0x1E 0xB7 0x13 0x83 0xD4 0x30 0x40 0xD9 CAT 2 SERVER Cat2(config)#do sh vtp status VTP Version capable : 1 to 3 VTP version running : 1 VTP Domain Name : TEST VTP Pruning Mode : Disabled VTP Traps Generation : Disabled Device ID : 001a.6de2.4700 Configuration last modified by 2.2.2.2 at 3-1-93 01:31:09 Local updater ID is 2.2.2.2 on interface Lo1 (first layer3 interface found) Feature VLAN: -------------- VTP Operating Mode : Server Maximum VLANs supported locally : 1005 Number of existing VLANs : 9 Configuration Revision : 3 MD5 digest : 0x97 0xD7 0x50 0x1F 0x0F 0x77 0x7E 0x3A 0x1E 0xB7 0x13 0x83 0xD4 0x30 0x40 0xD9 2.2.2.2 is the loopback address of Cat 2.. wonder what would happen if the vtp source was vlan1 with an ip of 2.2.2.2 :) Hopefully this helps? So CDP, STP, VTP, etc., do not cross a trunk if you do not allow the native VLAN? I'll have to lab that up, I'm pretty sure that's not the case. On Thu, May 10, 2012 at 12:17 PM, Rob Hoover <[email protected]> wrote: > If the trunk is configured for allow, you do have to include the native > vlan in that statement. > On May 10, 2012 8:29 AM, "Bob McCouch" <[email protected]> wrote: > >> I believe the exception there is L2 control packets (VTP, CDP, STP, DTP, >> etc) that will all be sent untagged over the link whether the native VLAN >> is actually allowed on the trunk or not. >> >> Marko, do I have that right? >> >> >> >> On Thu, May 10, 2012 at 8:33 AM, Rob Hoover <[email protected]> wrote: >> >>> You have to list the native VLAN in the allowed statement or the packet >>> will be dropped. >>> On May 10, 2012 3:31 AM, "imad Abdallah" <[email protected]> >>> wrote: >>> >>> > >>> > Hi,I'm bit confused regarding native vlan and trunk allowed vlan. Let's >>> > say we have two switches connected via trunk. Both switches have the >>> > default native vlan (vlan 1). On the trunk between them, we issued the >>> > command: swi trun allo vlan 2-100. So the native vlan 1 is not allowed >>> on >>> > the trunk. is it mandatory for the native vlan to be allowed on thee >>> trunk? >>> > Do we need to change the native vlan from (1) to any other vlan that >>> are >>> > allowed through the trunk? Thanks >>> > _______________________________________________ >>> > For more information regarding industry leading CCIE Lab training, >>> please >>> > visit www.ipexpert.com >>> > >>> > Are you a CCNP or CCIE and looking for a job? Check out >>> > www.PlatinumPlacement.com >>> > >>> > http://onlinestudylist.com/mailman/listinfo/ccie_rs >>> > >>> _______________________________________________ >>> For more information regarding industry leading CCIE Lab training, >>> please visit www.ipexpert.com >>> >>> Are you a CCNP or CCIE and looking for a job? Check out >>> www.PlatinumPlacement.com >>> >>> http://onlinestudylist.com/mailman/listinfo/ccie_rs >>> >> >> _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs ________________________________ From: Bob McCouch <[email protected]> To: Rob Hoover <[email protected]> Cc: [email protected] Sent: Thursday, May 10, 2012 12:19 PM Subject: Re: [OSL | CCIE_RS] Native Vlan _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
