1
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We can confirm which ports or Chungking on our switches by as an example going on to switch one and

2
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topping show interface's trunk as you can see here the command show to faces trunk shows me that gigabit

3
00:00:18,670 --> 00:00:26,170
to 0 0 1 2 and 3 are set on for trunking using 80 to read one key.

4
00:00:26,170 --> 00:00:29,620
The status is trunking and the native Vilain is villain one.

5
00:00:29,890 --> 00:00:35,040
The villains allowed across those ports of villains 1 to 4000 in 94.

6
00:00:35,260 --> 00:00:40,360
In other words we've allowed all villains the villains currently allowed and active in the management

7
00:00:40,360 --> 00:00:49,190
domain are 1 10 and 20 villains in the spending tree forcing state to not pruned or 1 10 and 20.

8
00:00:49,480 --> 00:00:55,840
We'll talk about spending in a moment but the port is the only port that is forwarding traffic across

9
00:00:55,840 --> 00:01:05,710
a typical port one and two are currently blocked as shown here because port 1 2 and 3 are currently

10
00:01:05,710 --> 00:01:15,710
blocked three spanning tree shows spending tree as an example shows me that those ports are blocking

11
00:01:16,310 --> 00:01:17,810
this port is not a trunk port.

12
00:01:17,810 --> 00:01:29,830
This is an access port so show interface trunk shows me in a nice simple format which interfaces are

13
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configured for trunking which encapsulation is used and which ports are forwarding for which villans

14
00:01:38,440 --> 00:01:48,810
Let's have a look at Switch to as an example on which to show interface trunk port gigabit 0 0 0 1 0

15
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2 and 0 3.

16
00:01:50,460 --> 00:01:54,200
So these interfaces are trunking the mode is on.

17
00:01:54,270 --> 00:01:59,520
We're not using DTP and kept salaciousness one key status is trunking.

18
00:01:59,530 --> 00:02:01,670
Native Land is VLAN 1.

19
00:02:01,860 --> 00:02:06,310
The villans allowed across those ports are one to four thousand ninety four.

20
00:02:06,630 --> 00:02:13,320
Currently the villans allowed an active in the management domain a 1 10 and 20 villans in spending tree

21
00:02:13,320 --> 00:02:21,630
fording state and not pruned a 1 10 and 20 across all the ports at the moment Chauvel and brief shows

22
00:02:21,630 --> 00:02:29,910
me that to only have a villain 1 10 and 20 configured on the switch and hence the switch is forwarding

23
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those villans across those ports one 10 and 20 is forwarded across Port gigabit 0 1 2 and 3 spending

24
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trees and not blocking any of these ports and I can see that by tapping shows spanning tree as you can

25
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see here all those ports are forwarding and they are designated ports because the switch is the root

26
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switch where as on switch one once again shows spending tree shows me that the switch is not to the

27
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router bridge or router switch of the spending tree these ports 1 2 and 3.

28
00:03:04,890 --> 00:03:13,930
So 1 2 and 3 are blocking show interface trunk shows me that those ports are trunk ports but only gigabit

29
00:03:14,040 --> 00:03:18,260
00 is forwarding Villines 1 10 and 20 across.

30
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So showing defaces trunk is a very useful command to see a summary of your trunk's.