Severity 3 Got Virtual?MenuSkip to contentHomeAbout Me« Older postsUsing VTP version 1 can cause issues in productionBy  Ubergeek |   June 4, 2019  - 4:42 am |June 4, 2019  Uncategorized   Leave a commentTweetSolutions for configuring Cisco DTPBy  Ubergeek |   June 1, 2019  - 3:50 am |June 1, 2019  Uncategorized   Leave a commentTweetHere I demonstrate the 2 solutions for configuring switchports to successifully use dynamic trunking protocol to form a trunkIn short atleast 1 side must be configured as dynamic desirable instead of dynamic auto… both side can be dynamic desirible but both sides can -not- be dynamic auto…that will end up with the ports operating in static access mode2 ways to disable ciscos DTPBy  Ubergeek |   May 30, 2019  - 5:10 am |May 30, 2019  Uncategorized   Leave a commentTweetIn this video i describe the 2 ways to disable cisco DTP on switch links in cisco ioschange the port to an access por with switchport mode access under the specific interface2. use the command switch nonegotiate at the interface levelgetting started with using layer 2 features of IOUBy  Ubergeek |   April 28, 2019  - 12:22 am |April 28, 2019  Uncategorized   Leave a comment
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some IOU images come preconfigured like this:
! interface Ethernet0/0  no ip address  duplex auto
IOU1#sh int e0/0 switchport Name: Et0/0 Switchport: Disabled
in order to use layer 2 features for trhis port we will need to do the following:
IOU1#conf t Enter configuration commands, one per line.  End with CNTL/Z. IOU1(config)#int e0/0 IOU1(config-if)#switchport IOU1(config-if)#^Z IOU1# *Apr 27 22:17:34.933: %SYS-5-CONFIG_I: Configured from console by console IOU1# *Apr 27 22:17:35.317: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up *Apr 27 22:17:36.318: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to up
now we can see layer 2 features of the port as expected:
IOU1#sh int e0/0 switchport
Name: Et0/0
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: static access
Administrative Trunking Encapsulation: negotiate
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
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Using VTP version 1 can cause issues in production
Solutions for configuring Cisco DTP
2 ways to disable ciscos DTP
getting started with using layer 2 features of IOU
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