Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
We have a problem with CDP packets on sent by our Cisco 6509's. Unlike our other Cisco switches (4948G, 5020, etc.), the 6509 tags administrative traffic on the native vlan. As a result the CDP packets are sent with an 802.1Q header with a tag of 1...
I need to identify which port a particular MAC address is connected to on a 6500 running IOS 12.2(17r)S4.show adjacency tells me the vlan but not the port. Show ipv6 neighbors does the same. -Dave
On the 5020, running Nexus OS, with the config below, CDP packets are not tagged:interface Ethernet1/2 switchport mode trunk switchport trunk native vlan 155on the 6509, running IOS, with the config below, CDP packets are tagged:interface GigabitEt...
Mandlenkosi, I am trying to stop the tagging of CDP packets, not enable it for the native vlan. Currently all packets on the native vlan are untagged, except for CDP. CDP is tagged only if the native vlan is something other than 1.
OK, I tried all of these, only the last one results in CDP packets being untagged:access vlan: 1, native vlan: 155, mode: trunkaccess vlan 155, native vlan: 155, mode: trunkaccess vlan: 1, native vlan: 1, mode: trunkSo it looks like changing the nati...
Yes, I had the same question: "I don't understand why it would be sending the packets on vlan 1"The show interface switchport does include the access vlan setting:Access Mode VLAN: 1 (default)Perhaps I should set the access mode vlan to 155 so that i...
