2006年11月20日 · A. Vlan 1 is the deafult vlan which is used to send control traffic like VTP,STP,DTP,CDP over the links.It has nothing to do with the native vlan.In earlier IOS versions removing vlan 1 over the trunk wasnot allowed as the control traffic was only bound to vlan1.

The default VLAN is always set to VLAN 1 and it is the VLAN that comes pre-configured on every switch (Cisco, HP, etc). The concept behind this is that the switch needs at least one VLAN to operate as a switch hence the reason for VLAN 1.

the use of vlan 1 will not survive a security audit. as noted best practice is to shut down vlan 1, remove all ports from vlan 1 and use an alternative native vlan. the age old cunundrum is that with these practices, some control traffic will still pass across vlan 1; shocking but proven. however, due diligence demands following best practice here whereby one survives the audit and will not ...

2019年5月7日 · To mitigate this problem there are two fixes. The first is to place all unused switchports in a VLAN other than 1. Whatever this VLAN ID, it should not be trunked off the switch. Combine this with defining the native VLAN ID on your trunk links to a number other than 1 (at both ends of the link). This ensures VLAN1 is actually tagged on the ...

CDP & VTP both belong to vlan 1, if native vlan is 1 they will be untagged, if the native vlan is anything other than 1 they will all be tagged with 1. "Quote off" Is that association configurable? Not all Cisco switches follow the rule. e.g. a 5020 sends untagged CDP packets, even. with this config: interface Ethernet1/1. switchport mode trunk

2024年1月8日 · Review Security Policies: Check if there are any security policies or access control lists (ACLs) that might be blocking traffic on VLAN 1. Review the switch and VMware server security settings. Test Connectivity: Use tools like ping to test connectivity between hosts in VLAN 1 and the VMware server. This can help identify if the issue is ...

The 'Main Switch' is now divided into 3 switches that we created and itself, as that cannot be removed, viz. Vlan 1; Therefore the original switch is now divided into 4 switches, including itself; Vlan 1 = 'Main Switch' = Ports 9 to 26 + Ports 35 to 40; Vlan 10 = 'Switch 1' = Ports 1 to 8; Vlan 20 = 'Switch 2' = Ports 27 to 34

2021年6月28日 · Short answer - Yes, But all ports will have to be trunk to allow both vlan traffic. Select the Admin mode - 802.1Q Trunk . Trunk-Vlans allowed ( Add both 1 and 100 ) - 1,100 . From the device console you can use the range command to do the same. I have some additional questions. 1. Why do you want all ports to use both vlans, is one of them a ...

All ports are set to vlan 1 by default and vlan 1 is used by Control traffic (STP, DTP, CDP, etc). So, Management vlan - use to connect to devices by IT -should be something else; Yes, you could shutdown any Unused ports but usually they are moved to different vlan id that would not be use for data traffic (so called "park vlan"); it is easier ...

2016年6月21日 · Cisco routers know that by default, VLAN 1 is treated as a native VLAN by Catalyst switches, so whenever you configure encapsulation dot1q 1 on a subinterface, the router will add the native keyword automatically, and there is no direct way of telling the router to not to do that. The only workaround I know of is the one I have mentioned ...