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1. Re: RSTP Link types
Scott Morris - CCDE/4xCCIE/2xJNCIE Dec 29, 2008 6:25 PM (in response to Chris)The link-type point-to-point is for swtich links (non-portfast) and works within the constraints of PVST (recommended for Rapid-PVST).
There's also the concept of "portfast trunk".
Anyway, with point-to-point as a link-type, that has to do with negotiation in the case where one side becomes designated (kinda has to happen anyway) that they will negotiate a quicker jump to forwarding state!
HTH,
Scott
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2. Re: RSTP Link types
B Haines Dec 29, 2008 6:33 PM (in response to Chris)To further elaborate on Scott's explanation:
"Link Type
RSTP can only achieve rapid transition to the forwarding state on edge ports and on point-to-point links. The link type is automatically derived from the duplex mode of a port. A port that operates in full-duplex is assumed to be point-to-point, while a half-duplex port is considered as a shared port by default. This automatic link type setting can be overridden by explicit configuration. In switched networks today, most links operate in full-duplex mode and are treated as point-to-point links by RSTP. This makes them candidates for rapid transition to the forwarding state. "
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml
Als0, here is a nice article on duplex issues! (mismatches etc.) Just thought that I would share since the two are kind of related!
http://www.itsyourip.com/cisco/speed-and-duplex-issues-when-connecting-to-cisco-switches/
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3. Re: RSTP Link types
Scott Morris - CCDE/4xCCIE/2xJNCIE Dec 29, 2008 6:41 PM (in response to B Haines)That's the whitepaper I was trying to find.
Thanks!
Scott
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4. Re: RSTP Link types
B Haines Dec 29, 2008 6:52 PM (in response to Scott Morris - CCDE/4xCCIE/2xJNCIE)No prob! You pretty much summed that up off of the top of your head! LoL
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5. Re: RSTP Link types
Scott Morris - CCDE/4xCCIE/2xJNCIE Dec 29, 2008 7:06 PM (in response to B Haines)Vast Collection of Useless Knowledge.
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6. Re: RSTP Link types
shanekillian Jan 14, 2009 12:57 AM (in response to B Haines)Just what I was looking for!
I couldn't help but feel abit lost reading chapter two of ICND2 (STP, RSTP, PVSTP etc.), I found the concept to be .... well, relatively simple in the beginning but as the book continued through the examplse/explainations it confused me more.
I'm going to take a look at that whitepaper, can anyone suggest other sources for grasping STP/RSTP ?
I'll give the book a read a few times anyway so that I have some chance of absorbing it all.
Thanks,
Shane
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7. Re: RSTP Link types
Chris Jan 15, 2009 1:19 PM (in response to shanekillian)Hello Shane,
The VOD's on STP/RSTP on this site are very well done:
https://learningnetwork.cisco.com/docs/DOC-2549