Spanning Tree Protocol - Revision history

Kevinmoy at 05:10, 2 May 2012

2012-05-02T05:10:56Z

← Older revision		Revision as of 05:10, 2 May 2012
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	''Spanning-Tree Protocol is a way to have redundant paths and stop loops from having. All Ethernet networks only work well if there is only one path between two points. Having many different paths will cause loops in a network. This is because frames to be duplicated. The Spanning-Tree protocol will define all switches in the network. The algorithm will automatically change the STP topology by activating or inactivating certain paths, so that only one path will be present between two points. The end-devices do not know they are connected to one network or many networks.''		''Spanning-Tree Protocol is a way to have redundant paths and stop loops from having. All Ethernet networks only work well if there is only one path between two points. Having many different paths will cause loops in a network. This is because frames might be duplicated. The Spanning-Tree protocol will define all switches in the network. The algorithm will automatically change the STP topology by activating or inactivating certain paths, so that only one path will be present between two points. The end-devices do not know if they are connected to one network or many networks.''


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	*Selects the root port for all other switches		*Selects the root port for all other switches
	**One port on all switches, that are not root bridges,		**One port on all switches, that are not root bridges
	**This port is the lowest cost path to the root bridge.		**This port is the lowest cost path to the root bridge.
	**If two ports have the same priority, the lowest port number will become the root port.		**If two ports have the same priority, the lowest port number will become the root port.
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	\|		\|
	\|-		\|-
	\| '''Listening'''\|\|According to the amount of BPDUs spanning tree tells this port it is able to forward traffic. ~~The~~ port is getting BPDUs it’s also making ~~its~~ own BPDUs to tell other switches that it preparing to forward frames. The default time in this state is 15 seconds (Forward Delay)		\| '''Listening'''\|\|According to the amount of BPDUs spanning tree tells this port it is able to forward traffic. This port is getting BPDUs, it’s also making it's own BPDUs to tell other switches that it preparing to forward frames. The default time in this state is 15 seconds (Forward Delay)
	\|-		\|-
	\|		\|

Kevinmoy at 05:03, 2 May 2012

2012-05-02T05:03:35Z

← Older revision		Revision as of 05:03, 2 May 2012
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	''Spanning-Tree Protocol is a way to have redundant paths and stop loops from having. All Ethernet networks only work well if there is only one path between two points. Having many different paths will cause loops in a network. This ~~cause~~ frames to be duplicated. The Spanning-Tree protocol will define all switches in the network. The algorithm will automatically change the STP topology by activating or inactivating certain paths, so that only one path will be present between two points. The end-devices do not know they are connected to one network or many networks.''		''Spanning-Tree Protocol is a way to have redundant paths and stop loops from having. All Ethernet networks only work well if there is only one path between two points. Having many different paths will cause loops in a network. This is because frames to be duplicated. The Spanning-Tree protocol will define all switches in the network. The algorithm will automatically change the STP topology by activating or inactivating certain paths, so that only one path will be present between two points. The end-devices do not know they are connected to one network or many networks.''

Kevinmoy: /* RSTP Port Roles */

2012-05-02T04:16:39Z

RSTP Port Roles

← Older revision		Revision as of 04:16, 2 May 2012
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	~~'''The show version command in order to display the software version that the switch runs. '''~~
	~~Kevins-switch1> '''show version'''~~
	~~WS-C5505 Software, Version McpSW: 4.2(1) NmpSW: 4.2(1)~~
	~~Copyright (c) 1995-1998 by Cisco Systems~~
	~~NMP S/W compiled on Sep 8 1998, 10:30:21~~
	~~MCP S/W compiled on Sep 08 1998, 10:26:29~~
	~~System Bootstrap Version: 5.1(2)~~
	~~Hardware Version: 1.0 Model: WS-C5505 Serial #: 066509927~~
	~~Mod Port Model Serial # Versions~~
	~~--- ---- ---------- --------- ----------------------------------------~~
	~~1 0 WS-X5530 008676033 Hw : 2.3~~
	~~Fw : 5.1(2)~~
	~~Fw1: 4.4(1)~~
	~~Sw : 4.2(1)~~

	'''This command is used to set the swtich as the root bridge for certain VLANS'''		'''This command is used to set the swtich as the root bridge for certain VLANS'''

Kevinmoy: /* STP Steps */

2012-05-02T03:46:32Z

STP Steps

← Older revision		Revision as of 03:46, 2 May 2012
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	'''Port Roles ~~on a Nondesignated Switch~~'''		'''Port Roles'''
	{\| {{table}}		{\| {{table}}
	\| align="center" style="background:#f0f0f0;"\|'''Port'''		\| align="center" style="background:#f0f0f0;"\|'''Port'''

Kevinmoy: /* Flex Links */

2012-04-29T18:40:08Z

Flex Links

← Older revision		Revision as of 18:40, 29 April 2012
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	* None of the single links can be part of a EtherChannal pair, but you could configure two port-channels as Flex Links and you can also congigure a port-channel and a physical link as a interface as a Flex Link.		* None of the single links can be part of a EtherChannal pair, but you could configure two port-channels as Flex Links and you can also congigure a port-channel and a physical link as a interface as a Flex Link.
	* STP is disabled on Flex Link ports. This is true even if VLANs are present on the port and configured for STP.		* STP is disabled on Flex Link ports. This is true even if VLANs are present on the port and configured for STP.


			Kevins-SW# configure terminal
			Kevins-SW(conf)# interface fastethernet0/1
			Kevins-SW(conf-if)# switchport backup interface fastethernet0/2
			Kevins-SW(conf-if)# end
			Kevins-SW# show interface switchport backup
			Switch Interface Backup Pairs:
			Active Interface Backup Interface State
			.....................................................................
			FastEthernet0/1 FastEthernet0/2 Active Up/Backup Standby

Kevinmoy: /* Flex Links Guidelines */

2012-04-29T18:26:28Z

Flex Links Guidelines

← Older revision		Revision as of 18:26, 29 April 2012
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	[[File:Flex.gif]]		[[File:Flex.gif]]

	==''' Flex Links Guidelines '''==		''' Flex Links Guidelines '''

Kevinmoy: /* Flex Links Guidelines */

2012-04-29T18:26:14Z

Flex Links Guidelines

← Older revision		Revision as of 18:26, 29 April 2012
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	[[File:Flex.gif]]		[[File:Flex.gif]]

	== Flex Links Guidelines ==		==''' Flex Links Guidelines '''==



	* You can configure only a single Flex Links backup link for any active link.		* You can configure only a single Flex Links backup link for any active link.

Kevinmoy: /* Flex Links */

2012-04-29T18:24:07Z

Flex Links

← Older revision		Revision as of 18:24, 29 April 2012
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	== Flex Links ==		==''' Flex Links '''==
			''Flex links is an alternative to STP. This is achieved by having a backup link or Flex link associated with each other. The Flex links can be on the same switch or another on the stack. When ever one of the pairs is forwarding the other is in standby mode.''

			[[File:Flex.gif]]

			== Flex Links Guidelines ==

			* You can configure only a single Flex Links backup link for any active link.
			* A interface can only be part of one pair; so it must me active of standby, if it is a Flex Link
			* None of the single links can be part of a EtherChannal pair, but you could configure two port-channels as Flex Links and you can also congigure a port-channel and a physical link as a interface as a Flex Link.
			* STP is disabled on Flex Link ports. This is true even if VLANs are present on the port and configured for STP.

Kevinmoy at 04:09, 29 April 2012

2012-04-29T04:09:09Z

← Older revision		Revision as of 04:09, 29 April 2012
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	''The Spanning Tree Protocol’s purpose is preventing bridging loops and allows a network to ~~quick~~ recover if the primary path fails. STP was invented by Radia Perlman from the Digital Equipment Corporation.		''The Spanning Tree Protocol’s purpose is preventing bridging loops and allows a network to quickly recover if the primary path fails. STP was invented by Radia Perlman from the Digital Equipment Corporation.

Kevinmoy: /* Trouble Shooting Spanning Tree */

2012-04-29T04:08:29Z

Trouble Shooting Spanning Tree

← Older revision		Revision as of 04:08, 29 April 2012
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	'''PortFast-related Errors'''		'''PortFast-related Errors'''
	If a port that is a hub or switch accidently get PortFast enabled on it, a loop will form. This is because the forward delay will not occur.		If a port that is a hub or switch accidently get PortFast enabled on it, a loop will form. This is because the forward delay will not occur.


			== Flex Links ==