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12 years 10 months ago #37229 by sais
commands was created by sais
can brief desribe wat is purpose o this command used in 3560 switch

spanning-tree mode pvst

spanning-tree extend system-id

no spanning-tree vlan 88


interface Port-channel1

switchport trunk encapsulation dot1q

switchport trunk native vlan 87
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12 years 10 months ago #37231 by Nevins
Replied by Nevins on topic Re: commands
[code:1]spanning-tree mode pvst [/code:1]

Per vlan spanning tree was enabled which mean per lan group (vlan) you have segmented in your network into more then one loop redundancy (spanning tree) groups.

[code:1]
no spanning-tree vlan 88 [/code:1]

states that loop protection is disabled on that vlan and no spanning-tree is taking place

[code:1]
interface Port-channel1

switchport trunk encapsulation dot1q

switchport trunk native vlan 87[/code:1]


This code states that on Port-channel1 vlan 87 will act as the native vlan meaning if any frames are not tagged into a specific vlan it will default to vlan 87.


www.cisco.com/warp/public/473/spanning_tree1.swf

Explains spanning tree very well. Per vlan spanning-tree is only different in that it blocks sets blocking states per vlan not per trunk link. (trunking still must be enabled)


Edit: I could be a bit more descriptive but I have a job interview to go to at 3pm it's 12:00 noon. If you have any more questions after viewing the flash about spanning tree I would be glad to help explain.

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12 years 10 months ago #37232 by next_virus
Replied by next_virus on topic Re: commands
Best of lick for the interview and thanks for the flash link.
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12 years 10 months ago #37233 by next_virus
Replied by next_virus on topic Re: commands
Nevins,

The link you have send for STP was really execellent. I was trying to find some more links on different topics, but it didn't allowed me to access. Always getting an error "session expired".
is it possible for you to provide some more links on different topics (especially on switches).

Thanks[/u][/i]
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12 years 10 months ago #37235 by Nevins
Replied by Nevins on topic Re: commands
www.firewall.cx/ftopict-7477-.html

I tried to make a repository there a while back and get more people to plug into it but it never really took off.

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12 years 10 months ago #37238 by sais
Replied by sais on topic Re: commands
thank you . the link u have given is more useful. if u have some link related ethernth group, and switch related topics send me ok.
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