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Okay so let's see if a trunk is formed between switch one and switch two.
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And if a trunk is formed between switch to and switch three this is the capture between switch one and
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switch two.
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I'm going to do a search for DDP so I've named to the switches to make it easy to know which switch
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is sending DDP messages.
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Cisco switch one Cisco switch two.
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So again this is the link between these two switches.
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If we look at the dynamic trunk protocol.
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Notice operating administer of mode is access order operating administer of ISIL negotiated so it looks
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like they may negotiate to use ISIL trunk status is access auto and what I'll do is just make this bigger
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so we can see the full why shock capture.
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Notice trunk operating status as access trunk administrative status is order.
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In other words order has been used on that switch.
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Now this is switch one and I could show you that by looking at to the console of the switch so console
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of switch one
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show interface trunk firstly shows us that no trunks are formed.
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But notice show interface gigabit 00 switch port.
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What you'll notice here is this command shows the interface interface is a switch port administer of
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mode is dynamic auto operational mode is static access in the y shock capture we see operating status
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as access administrative mode his order said administer of mode is dynamic auto over there that's what
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we see here static access is the operational mode so operating mode is access.
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So at this point there's no trucking on that port the port is acting as an access VLAN in VLAN 1 as
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you can see over there.
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Negotiation of trucking is on but a trunk is not formed.
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And as I go through the messages I mean you must be careful looking at the very first messages go and
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look at the later messages to see if the state changed notice stole access order trunk type is ISIL
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negotiated they would negotiate to use ISIL if one of the sides negotiated switch to is also set to
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access auto so the point is notice over here DTP operating and master of mode access auto operating
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administer of ISIL negotiated both these switches are using DTP I'm searching for DDP messages and we
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can see DTP messages but they set to mode auto mode auto or dynamic auto as we can see here means that
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that side will not negotiate to form a trunk the other side would have to initiate trunk yes switch
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to show interface gigabit 00 switch port.
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Notice dynamic auto that is the administrative mode operational mode is static access so they both configured
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to use dynamic auto because neither of them initiate a connection to the other side they both passively
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waiting basically for the other side to initiate trucking.
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Trucking is not formed so there is no trunk formed between switch one and switch two I won't use the
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show trunk command and switch to yet because we want to see what happens on the right hand side.
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But notice here show interface trunk no trunk is formed on switch one OK so I kind of hinted at it.
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What do you think is going to happen between switch tune switch three years the why shock capture between
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switch to switch three all fulltime for DDP once again yes switch three messages.
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Notice the difference dynamic trunk protocol access desirable operating administrative mode ISIL dot
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one key.
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So that's different to what we saw on the other side.
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If we look at switch to on this link.
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Notice trunk auto editor the one Q negotiated so a little bit different notice.
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Switch to switch three.
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One side is using auto the other side is using desirable.
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So if I go right down to the end this is switch to trunk status is type of trunk trunk.
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Value is trunk auto trunk operating status is a trunk.
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Now if we go back to the other switches so this is switch to talking to switch one and we look at the
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trunk status notice trunk status is access and I don't if that's confusing so let me show you on the
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diagram.
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So on the left hand side switch to to switch one this is the capture between switch one switch to notice
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operating status is access.
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This is an access port but on this side.
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Notice trunk operating status is trunk that side's access right inside is a trunk.
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It's become a trunk trunk administrative status is auto the side it's also auto.
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But because switch three initiated the trunk notice it says desirable here a trunk was formed between
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switch to and switch three so because switch three initiated the trunk because it's set to desirable
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a trunk is formed we can see that once again by looking at the console of the switches.
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So on switch three show interface gigabit 00 switch port.
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Notice command shows administer mode dynamic desirable encapsulation used is one key operational motors
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trunk it's operating as a trunk using dot one key show interface trunk we can see that encapsulation
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is not one key trucking is enabled if we have a look on the other side it's a little bit different here
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show interface trunk on this side it's negotiated to use dot one Q and trucking is enabled with this
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side encapsulation is not one Q And the reason for that is I explicitly configured the encapsulation
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as dot one Q and set it to dynamic desirable I wanted to show you a trunk that was negotiated with DTP
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and using dot one Q rather than ISIL if I had not put this in the switches would have actually negotiated
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to form an ISIL trunk these switches will use ISIL first and then dot one Q So I wanted to explicitly
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force it to use dot one Q So they will try and use ISIL but if they can't then they'll use dot one Q
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But again I've overridden that or I forced the switch to use dot one key was the side notice it could
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have used ISIL or dot one Q So again on switch three if we got to go up here I noticed trunk desirable
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dot one Q Dot one key where as on switch to trunk auto dot one Q negotiated so no trunk desirable dot
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one Q Dot one key trunk auto dot one Q negotiated one side was forty used on one Q The other side negotiated
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to use dot one key Okay so in summary left hand side doesn't become a trunk because both sides are set
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to auto right hand side does become a trunk because one side was set to dynamic desirable as we can
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see over there and uses dot one Q on the side show interface trunk the only trunk that was negotiated
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is on gigabit 0 1 Okay how are you doing.
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Are you able to answer these questions do you enjoy this please give me feedback.
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Do you enjoy these kind of quiz questions.
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