This issue occurs in a scenario where two Cisco Catalyst switches in two different VTP domains are connected together via a cross-over cable and you see a link light, but no traffic passes at the Layer 2 level between the switches.
A trunk link can be negotiated between two switches only if these switches belong to the same VTP management domain or if one or both switches have not defined their VTP domain (that is the NULL domain).
Dynamic Trunking Protocol (DTP) sends the VTP domain name in a DTP packet. Therefore, if you have two ends of a link that belong to different VTP domains, the trunk does not come up if you use DTP.
Note: The VTP domain name is case sensitive. 'CISCO' and 'cisco' are two different domain names.
If two switches are in different VTP domains and trunking is desired between them, you must configure the trunk mode as ON or NONEGOTIATE on both sides in order to allow the trunk to come up without DTP negotiation agreement. In other words, this setting forces the link to be a trunk link.
The switchport nonegotiate command specifies that the device does not engage in a negotiation protocol on an interface.
Hi,I‘m planning to use a C9300 as a layer 3 switch... probably someone can tell me which Parameters (switching bandwidth, forwarding rate, etc.) I should pay attention to and understand why, so that I don‘t get any performance problems?thank you for your ...
Hi all We have a fairly simple network, but I now want to add a separate vlan 20 for guest traffic. Until now, we have not had any vlans configured. We have wireless access points and they can attach an SSID to a VLAN. This is working correctly ...
Good Afternoon Brains Trust. I have just completed a fresh install of Cisco Prime 3.9 on both my Primary and Secondary PI servers.I've set up HA in the past on 3.7 with no issues, however when I followed the same procedure on 3.9 I have found that I ...
HiI have been using Packet Tracer for a long time. I first used it on Windows 7 and it was all O.K.Now that I bought a new PC with Windows 10 (last ver.) I have a problem that the association with the pkt extension of my files only runs an empty Packet Tr...
Currently doing a bgp rpki topology and set up an ubuntu server with an rpki validator and everything is working. Now, trying to connect my bgp routers to the rpki validator. I enter router bgp <as number> Then Device(confi...