Hey skunks I need to implement fastest convergence on VLAN's. One way is implementing PVST (Per VLAN STP) and have preset root bridges, now the question which among the following facilitate faster root bridge election and hence quicker convergence *#spanning-tree vlan **vlan_no.** priority **value** #spanning-tree vlan **vlan_no.** root **{primary |secondary}* The second way is implement Multiple Spanning Tree (MST), though I havent implemented it and dont know the shortcoming but seems faster and lighter than PVST. Question is how is the experience to those who have implemented it and speed of convergence and fault tolerance ./TheMburu -- Conservatism is the adherence to the old tried against the new untried.
Hey If you're willing to do a little bit more work upfront and have an easier life later, I'd go with MST. While PVST (pvst+) adopted fast-convergence properties introduced by IEEE RSTP protocol, the core feature of keeping a separate copy of STP per VLAN did not change. Ie it still remained a challenge. Seeing the problems associated with PVST approach, Cisco came with idea of decoupling the concepts of STP instances and VLANs. MST. The initial implementation was called MISTP (Multiple Instances Spanning Tree) and later evolved into IEEE 802.1s standard called MSTP (Multiple Spanning Trees Protocol). Pvst can also be tuned to achieve faster convergence. Have a look at the design guides below. http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configurati... http://standards.ieee.org/getieee802/802.1.html http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configurati... Gitau Sent from my iPad On 24 Feb 2012, at 16:17, TheMburu George <themburu@gmail.com> wrote:
Hey skunks
I need to implement fastest convergence on VLAN's. One way is implementing PVST (Per VLAN STP) and have preset root bridges, now the question which among the following facilitate faster root bridge election and hence quicker convergence #spanning-tree vlan vlan_no. priority value #spanning-tree vlan vlan_no. root {primary |secondary}
The second way is implement Multiple Spanning Tree (MST), though I havent implemented it and dont know the shortcoming but seems faster and lighter than PVST. Question is how is the experience to those who have implemented it and speed of convergence and fault tolerance
./TheMburu -- Conservatism is the adherence to the old tried against the new untried. _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke ------------ List info, subscribe/unsubscribe http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks ------------
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I'd also recommend MSTP (If you really need to use STP that is...). It requires a lot of planning though but you will have no sleepless nights once its up and running. David On Fri, Feb 24, 2012 at 4:33 PM, John Gitau <jgitau@gmail.com> wrote:
Hey If you're willing to do a little bit more work upfront and have an easier life later, I'd go with MST.
While PVST (pvst+) adopted fast-convergence properties introduced by IEEE RSTP protocol, the core feature of keeping a separate copy of STP per VLAN did not change. Ie it still remained a challenge. Seeing the problems associated with PVST approach, Cisco came with idea of decoupling the concepts of STP instances and VLANs. MST. The initial implementation was called MISTP (Multiple Instances Spanning Tree) and later evolved into IEEE 802.1s standard called MSTP (Multiple Spanning Trees Protocol).
Pvst can also be tuned to achieve faster convergence. Have a look at the design guides below.
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configurati...
http://standards.ieee.org/getieee802/802.1.html
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configurati...
Gitau
Sent from my iPad
On 24 Feb 2012, at 16:17, TheMburu George <themburu@gmail.com> wrote:
Hey skunks
I need to implement fastest convergence on VLAN's. One way is implementing PVST (Per VLAN STP) and have preset root bridges, now the question which among the following facilitate faster root bridge election and hence quicker convergence #spanning-tree vlan vlan_no. priority value #spanning-tree vlan vlan_no. root {primary |secondary}
The second way is implement Multiple Spanning Tree (MST), though I havent implemented it and dont know the shortcoming but seems faster and lighter than PVST. Question is how is the experience to those who have implemented it and speed of convergence and fault tolerance
./TheMburu -- Conservatism is the adherence to the old tried against the new untried. _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke ------------ List info, subscribe/unsubscribe http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks ------------
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Ok Back to more preparation, was kinda hoping to go with PVST but was worried about the number of instances. To note im also running HSRP so I need the active HSRP side to be the root bridges. ./TheMburu On Fri, Feb 24, 2012 at 4:42 PM, David Kariuki <kariukidw@gmail.com> wrote:
I'd also recommend MSTP (If you really need to use STP that is...). It requires a lot of planning though but you will have no sleepless nights once its up and running.
David
On Fri, Feb 24, 2012 at 4:33 PM, John Gitau <jgitau@gmail.com> wrote:
Hey If you're willing to do a little bit more work upfront and have an easier life later, I'd go with MST.
While PVST (pvst+) adopted fast-convergence properties introduced by IEEE RSTP protocol, the core feature of keeping a separate copy of STP per VLAN did not change. Ie it still remained a challenge. Seeing the problems associated with PVST approach, Cisco came with idea of decoupling the concepts of STP instances and VLANs. MST. The initial implementation was called MISTP (Multiple Instances Spanning Tree) and later evolved into IEEE 802.1s standard called MSTP (Multiple Spanning Trees Protocol).
Pvst can also be tuned to achieve faster convergence. Have a look at the design guides below.
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configurati...
http://standards.ieee.org/getieee802/802.1.html
http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configurati...
Gitau
Sent from my iPad
On 24 Feb 2012, at 16:17, TheMburu George <themburu@gmail.com> wrote:
Hey skunks
I need to implement fastest convergence on VLAN's. One way is implementing PVST (Per VLAN STP) and have preset root bridges, now the question which among the following facilitate faster root bridge election and hence quicker convergence #spanning-tree vlan vlan_no. priority value #spanning-tree vlan vlan_no. root {primary |secondary}
The second way is implement Multiple Spanning Tree (MST), though I havent implemented it and dont know the shortcoming but seems faster and lighter than PVST. Question is how is the experience to those who have implemented it and speed of convergence and fault tolerance
./TheMburu -- Conservatism is the adherence to the old tried against the new untried. _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke ------------ List info, subscribe/unsubscribe http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks ------------
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eanog mailing list eanog@lists.my.co.ke http://lists.my.co.ke/cgi-bin/mailman/listinfo/eanog
_______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke ------------ List info, subscribe/unsubscribe http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks ------------
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-- Conservatism is the adherence to the old tried against the new untried.
Guys, Mburu did not mention the size of the network, to gauge it to the effort he wants to apply. -----Original Message----- From: David Kariuki <kariukidw@gmail.com> Sender: skunkworks-bounces@lists.my.co.ke Date: Fri, 24 Feb 2012 16:42:38 To: East Africa Network Operators Group<eanog@lists.my.co.ke> Reply-To: Skunkworks Mailing List <skunkworks@lists.my.co.ke> Cc: Skunkworks Mailing List<skunkworks@lists.my.co.ke> Subject: Re: [Skunkworks] [EANOG] STP convergence & MST _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke ------------ List info, subscribe/unsubscribe http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks ------------ Skunkworks Rules http://my.co.ke/phpbb/viewtopic.php?f=24&t=94 ------------ Other services @ http://my.co.ke
Well he specifically asked about two types of stp. I believe he has enough to go with now if thats the only issue he had. for all we know this was for his home network:--) If he needs more granulated answers he'll have to give more info:-) Sent from my iPad On 25 Feb 2012, at 23:10, "Stan Ngure" <stanngure@gmail.com> wrote:
Guys,
Mburu did not mention the size of the network, to gauge it to the effort he wants to apply.
-----Original Message----- From: David Kariuki <kariukidw@gmail.com> Sender: skunkworks-bounces@lists.my.co.ke Date: Fri, 24 Feb 2012 16:42:38 To: East Africa Network Operators Group<eanog@lists.my.co.ke> Reply-To: Skunkworks Mailing List <skunkworks@lists.my.co.ke> Cc: Skunkworks Mailing List<skunkworks@lists.my.co.ke> Subject: Re: [Skunkworks] [EANOG] STP convergence & MST
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Hahaha nope its not my home network but an entire cooperate network with around 60 vlans. Core-switch is Cisco 6513 so its pretty serious network. If i chose PST, which of the earlier commands leads to faster convergence? Note: I also have HSRP setup. ./TheMburu On Sun, Feb 26, 2012 at 8:22 AM, John Gitau <jgitau@gmail.com> wrote:
Well he specifically asked about two types of stp. I believe he has enough to go with now if thats the only issue he had. for all we know this was for his home network:--)
If he needs more granulated answers he'll have to give more info:-)
Sent from my iPad
On 25 Feb 2012, at 23:10, "Stan Ngure" <stanngure@gmail.com> wrote:
Guys,
Mburu did not mention the size of the network, to gauge it to the effort he wants to apply.
-----Original Message----- From: David Kariuki <kariukidw@gmail.com> Sender: skunkworks-bounces@lists.my.co.ke Date: Fri, 24 Feb 2012 16:42:38 To: East Africa Network Operators Group<eanog@lists.my.co.ke> Reply-To: Skunkworks Mailing List <skunkworks@lists.my.co.ke> Cc: Skunkworks Mailing List<skunkworks@lists.my.co.ke> Subject: Re: [Skunkworks] [EANOG] STP convergence & MST
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-- Conservatism is the adherence to the old tried against the new untried.
Well still not enough to go with but. With 60 vlans and I assume hsrp at the core running on a 6513: I'd create two hsrp groups, one for odd and the other for even numbered vlans. This makes your traffic 'balanced' .... Next i make a guess here that you have multiple switches each with multiple links to the core. To ensure no link goes to waste, make it such that the root ports for odd and even numbers don't use the same path. And only your 6513 can be the root bridge. Again I make an assumption. Tune your stp appropriately. Use the guides below for guidance. Or leave the convergence defaults. However ensure the access switches never become root bridges. http://blog.ine.com/wp-content/uploads/2010/04/understanding-stp-rstp-conver... http://blog.ine.com/2009/09/07/rstp-and-fast-convergence/ http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a00... While asking questions like this, it helps to throw in a topology, what you want to achieve, what you've tried, etc.....people otherwise second guess your requirements. It's like a request for quotation vs a request for information. The latter brings you marketing answers/guys. Sent from my iPad On 26 Feb 2012, at 19:52, TheMburu George <themburu@gmail.com> wrote:
Hahaha nope its not my home network but an entire cooperate network with around 60 vlans. Core-switch is Cisco 6513 so its pretty serious network.
If i chose PST, which of the earlier commands leads to faster convergence?
Note: I also have HSRP setup.
./TheMburu
On Sun, Feb 26, 2012 at 8:22 AM, John Gitau <jgitau@gmail.com> wrote: Well he specifically asked about two types of stp. I believe he has enough to go with now if thats the only issue he had. for all we know this was for his home network:--)
If he needs more granulated answers he'll have to give more info:-)
Sent from my iPad
On 25 Feb 2012, at 23:10, "Stan Ngure" <stanngure@gmail.com> wrote:
Guys,
Mburu did not mention the size of the network, to gauge it to the effort he wants to apply.
-----Original Message----- From: David Kariuki <kariukidw@gmail.com> Sender: skunkworks-bounces@lists.my.co.ke Date: Fri, 24 Feb 2012 16:42:38 To: East Africa Network Operators Group<eanog@lists.my.co.ke> Reply-To: Skunkworks Mailing List <skunkworks@lists.my.co.ke> Cc: Skunkworks Mailing List<skunkworks@lists.my.co.ke> Subject: Re: [Skunkworks] [EANOG] STP convergence & MST
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-- Conservatism is the adherence to the old tried against the new untried. _______________________________________________ Skunkworks mailing list Skunkworks@lists.my.co.ke ------------ List info, subscribe/unsubscribe http://lists.my.co.ke/cgi-bin/mailman/listinfo/skunkworks ------------
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Hey @Mburu, just a question from rustic knowledge from me. I assume this is some serious segmentations taking place, why don't you use layer 3 segmentation at the core rather than the run datalink layer on the entire network? The switches running BP will produce too many points of failure. IMHO. :-) On Sun, Feb 26, 2012 at 7:52 PM, TheMburu George <themburu@gmail.com> wrote:
Hahaha nope its not my home network but an entire cooperate network with around 60 vlans. Core-switch is Cisco 6513 so its pretty serious network.
If i chose PST, which of the earlier commands leads to faster convergence?
Note: I also have HSRP setup.
./TheMburu
I tend to support Aki in this one. Running a Layer 2 network with STP is a headache and this is why many providers prefer to run SDH networks. If you have good quality gear, 60 vlans i quite a big network for a corporate setting so L3 would be best. If the gear does not support layer 3 then MSTP would be a good way to go although HSRP is also equally good, depends on what you are most confortable doing. Just a word of advise, if there is a way you can avoid STP please do :) David On Sun, Feb 26, 2012 at 11:49 PM, aki <aki275@gmail.com> wrote:
Hey @Mburu, just a question from rustic knowledge from me. I assume this is some serious segmentations taking place, why don't you use layer 3 segmentation at the core rather than the run datalink layer on the entire network? The switches running BP will produce too many points of failure. IMHO. :-)
On Sun, Feb 26, 2012 at 7:52 PM, TheMburu George <themburu@gmail.com>wrote:
Hahaha nope its not my home network but an entire cooperate network with around 60 vlans. Core-switch is Cisco 6513 so its pretty serious network.
If i chose PST, which of the earlier commands leads to faster convergence?
Note: I also have HSRP setup.
./TheMburu
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Believe its phased out already, layer 3 is at a later phase and is a definate. This is to be in place as the review goes on. The thing is, there are two 6513 to do load-sharing so on the active HSRP core is where I shall have my STP root and vice versa, so it was a decision of how to best do it with the earlier highlighted choices. ./TheMburu On Mon, Feb 27, 2012 at 8:16 AM, David Kariuki <kariukidw@gmail.com> wrote:
I tend to support Aki in this one.
Running a Layer 2 network with STP is a headache and this is why many providers prefer to run SDH networks. If you have good quality gear, 60 vlans i quite a big network for a corporate setting so L3 would be best. If the gear does not support layer 3 then MSTP would be a good way to go although HSRP is also equally good, depends on what you are most confortable doing.
Just a word of advise, if there is a way you can avoid STP please do :)
David
On Sun, Feb 26, 2012 at 11:49 PM, aki <aki275@gmail.com> wrote:
Hey @Mburu, just a question from rustic knowledge from me. I assume this is some serious segmentations taking place, why don't you use layer 3 segmentation at the core rather than the run datalink layer on the entire network? The switches running BP will produce too many points of failure. IMHO. :-)
On Sun, Feb 26, 2012 at 7:52 PM, TheMburu George <themburu@gmail.com>wrote:
Hahaha nope its not my home network but an entire cooperate network with around 60 vlans. Core-switch is Cisco 6513 so its pretty serious network.
If i chose PST, which of the earlier commands leads to faster convergence?
Note: I also have HSRP setup.
./TheMburu
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-- Conservatism is the adherence to the old tried against the new untried.
participants (5)
-
aki -
David Kariuki -
John Gitau -
Stan Ngure -
TheMburu George