ok Switchport mode access + Switchport mode access show that Trunking is not negotiated ... But I have also read on Ruhann's note that when they ask to config a static access port , Switchport nonegotiate is needed ...
Marko, Tyson can you please confirm ? Thanks Yap for your time. 2011/1/18 Yap Chin Hoong - <[email protected]> > > Hi Nicholas, > I have tested that 'switchport mode access' + 'switchport nonegotiate' > is equivalent to 'switchport mode access' only. Switch ports configured with > both combinations of commands do not send DTP packets, as proven using the > 'debug dtp packets' privileged command on both Catalyst 2950 and Catalyst > 3560 series switches. > Below are some captures during my DTP studies. Thanks. > > TOS - Trunk Operational Status > > TAS - Trunk Administrative Status > > TNS - Trunk Negotiated Status > > TOT - Trunk Operational Trunking Encapsulation > > TAT - Trunk Administrative Trunking Encapsulation > > TNT - Trunk Negotiated Trunking Encapsulation > > > > > ================================================================================ > > C3560 > dynamic auto <> C3560 dynamic auto > > C3560#sh int fa0/1 > switchport | in Administrative Mode|Administrative Trunking|Negotiation > > Administrative > Mode: dynamic auto > > Administrative > Trunking Encapsulation: negotiate > > Negotiation > of Trunking: On > > C3560# > > C3560#sh dtp int fa0/1 | > in TOS|TOT > > TOS/TAS/TNS: > ACCESS/AUTO/ACCESS > > TOT/TAT/TNT: > NATIVE/NEGOTIATE/NATIVE > > 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad > TOT, 0 other > > C3560# > > > ================================================================================ > > C3560 > dynamic auto <> C2950 dynamic desirable > > C3560#sh int fa0/1 > switchport | in Administrative Mode|Administrative Trunking|Negotiation > > Administrative > Mode: dynamic auto > > Administrative > Trunking Encapsulation: negotiate > > Negotiation > of Trunking: On > > C3560# > > C3560#sh dtp int fa0/1 | > in TOS|TOT > > TOS/TAS/TNS: TRUNK/AUTO/TRUNK > > TOT/TAT/TNT: 802.1Q/NEGOTIATE/802.1Q > > 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad > TOT, 0 other > > C3560# > > > ================================================================================ > > C3560 > dynamic auto <> Cisco 2600 > > C3560#sh int fa0/1 > switchport | in Administrative Mode|Administrative Trunking|Negotiation > > Administrative > Mode: dynamic auto > > Administrative > Trunking Encapsulation: negotiate > > Negotiation > of Trunking: On > > C3560# > > C3560#sh dtp int fa0/1 | > in TOS|TOT > > TOS/TAS/TNS: > ACCESS/AUTO/ACCESS > > TOT/TAT/TNT: > NATIVE/NEGOTIATE/NATIVE > > 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad > TOT, 0 other > > C3560# > > > ================================================================================ > > C3560 > dynamic desirable <> C3560 dynamic auto > > C3560#sh int fa0/1 > switchport | in Administrative Mode|Administrative Trunking|Negotiation > > Administrative > Mode: dynamic desirable > > Administrative > Trunking Encapsulation: negotiate > > Negotiation > of Trunking: On > > C3560# > > C3560#sh dtp int fa0/1 | > in TOS|TOT > > TOS/TAS/TNS: > TRUNK/DESIRABLE/TRUNK > > TOT/TAT/TNT: ISL/NEGOTIATE/ISL > > 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad > TOT, 0 other > > C3560# > > > ================================================================================ > > C3560 > switchport trunk encapsulation dot1q, switchport mode trunk <> C3560 > dynamic auto > > C3560#sh int fa0/1 > switchport | in Administrative Mode|Administrative Trunking|Negotiation > > Administrative > Mode: trunk > > Administrative > Trunking Encapsulation: dot1q > > Negotiation > of Trunking: On > > C3560# > > C3560#sh dtp int fa0/1 | > in TOS|TOT > > TOS/TAS/TNS: TRUNK/ON/TRUNK > > TOT/TAT/TNT: > 802.1Q/802.1Q/802.1Q > > 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad > TOT, 0 other > > C3560# > > > ================================================================================ > > C3560 > switchport trunk encapsulation dot1q, switchport mode trunk, switchport > nonegotiate <> C3560 dynamic auto > > C3560#sh int fa0/1 > switchport | in Administrative Mode|Administrative Trunking|Negotiation > > Administrative > Mode: trunk > > Administrative > Trunking Encapsulation: dot1q > > Negotiation > of Trunking: Off > > C3560# > > C3560#sh dtp int fa0/1 | > in TOS|TOT > > TOS/TAS/TNS: > TRUNK/NONEGOTIATE/TRUNK > > TOT/TAT/TNT: > 802.1Q/802.1Q/802.1Q > > 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad > TOT, 0 other > > C3560# > > > ================================================================================ > > C3560 > switchport mode access <> C3560 switchport mode access > > C3560#sh int fa0/1 > switchport | in Administrative Mode|Administrative Trunking|Negotiation > > Administrative > Mode: static access > > Administrative > Trunking Encapsulation: negotiate > > Negotiation > of Trunking: Off > > C3560# > > C3560#sh dtp int fa0/1 | in > TOS|TOT > > TOS/TAS/TNS: ACCESS/OFF/ACCESS > > TOT/TAT/TNT: > UNKNOWN/NEGOTIATE/UNKNOWN > > 0 bad TLVs, 0 bad TAS, 0 bad TAT, 0 bad > TOT, 0 other > > C3560# > > > > regards, > YapCH > http://itcertguides.blogspot.com/ > > > Message: 3 > > Date: Tue, 18 Jan 2011 13:15:49 +0100 > > From: Nicolas MICHEL > > To: OSL Routing and Switching > > Subject: [OSL | CCIE_RS] DTP for Dummies > > Message-ID: > > > > Content-Type: text/plain; charset=ISO-8859-1 > > > > Hey there. > > > > > > DTP is such an easy protocol . There are only few commands to enable or > > disable it. > > I've been reading so much crap about this since my CCNA on cisco forums > that > > I d like to discuss about it with you guys. > > > > > > Some people says that DTP can only be shutted with the command switchport > > nonegotiage. > > Some people says that DTP can only be shutted with the command switchport > > mode access .... > > > > > > I disagree and I noticed that switchport mode access did indeed shut the > DTP > > process .... > > > > Rack1SW1(config-if)#do sh int fa0/21 sw > > Name: Fa0/21 > > Switchport: Enabled > > Administrative Mode: static access > > Operational Mode: static access > > Administrative Trunking Encapsulation: dot1q > > Operational Trunking Encapsulation: native > > *Negotiation of Trunking: Off* > > Access Mode VLAN: 1 (default) > > Trunking Native Mode VLAN: 146 (VLAN0146) > > Administrative Native VLAN tagging: enabled > > 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 Native VLAN tagging: enabled > > Administrative private-vlan trunk encapsulation: dot1q > > Administrative private-vlan trunk normal VLANs: none > > Administrative private-vlan trunk associations: none > > Administrative private-vlan trunk mappings: none > > Operational private-vlan: none > > Trunking VLANs Enabled: ALL > > Pruning VLANs Enabled: 2-1001 > > Capture Mode Disabled > > > > > > > > So what do you guys think about this newbie question ? :) > > > > > > -- > > Nicolas MICHEL > > Ingenieur R?seaux et Securit? (CCNA/CCNP) > > > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > -- Nicolas MICHEL Ingenieur Réseaux et Securité (CCNA/CCNP) _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
