HSRP - Revision history

Heth: /* Purpose of HSRP */

2020-10-06T10:32:36Z

‎Purpose of HSRP

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2016-09-01T07:58:36Z

‎The Virtual Router

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‎Links

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‎Tracking access Interfaces

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‎Note

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@@ Line 8: / Line 8: @@
 *There can be only one ''active'' Router
 *There can be only one ''standby'' Router
-*There can more routers in ''Speak'' state waiting to be ''standby'' Router.
+*There can more routers in ''Listen'' state waiting to be ''standby'' Router.
 = Other high availability Router protocols  =

← Older revision		Revision as of 08:29, 13 December 2017
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		+	__NOTOC__
	HSRP or Hot Standby Router Protocol is a protocol defined by Cisco and now described in [http://www.ietf.org/rfc/rfc2281.txt rfc2281]. HSRP is a Cisco-proprietary protocol.		HSRP or Hot Standby Router Protocol is a protocol defined by Cisco and now described in [http://www.ietf.org/rfc/rfc2281.txt rfc2281]. HSRP is a Cisco-proprietary protocol.

@@ Line 30: / Line 30: @@
 The Virtual Router is a MAC-address and a IP Address the ''active'' Router serves beside its configured IP address. If the ''active'' Router fails the ''standby'' Router becomes the Virtual Router by serving the virtual MAC-address and IP Address. If there are any Routers in ''speak'' state they will compete to be the new ''standby'' Router.
-If more than two Routers participate in a HSRP group the remaining Routers will be in Listen State. (See [https://tools.ietf.org/html/rfc2281#section-5.3 RFC 2281 Section 5.3]) There can be an arbitrary number of Routers in a HSRP group. (See [https://tools.ietf.org/html/rfc2281#section-1 RFC 2281 section 1]
+If more than two Routers participate in a HSRP group the remaining Routers will be in Listen State. (See [https://tools.ietf.org/html/rfc2281#section-5.3 RFC 2281 Section 5.3]) There can be an arbitrary number of Routers in a HSRP group. (See [https://tools.ietf.org/html/rfc2281#section-1 RFC 2281 section 1])
 == HSRP example  ==

← Older revision		Revision as of 07:53, 1 September 2016
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	The Virtual Router is a MAC-address and a IP Address the ''active'' Router serves beside its configured IP address. If the ''active'' Router fails the ''standby'' Router becomes the Virtual Router by serving the virtual MAC-address and IP Address. If there are any Routers in ''speak'' state they will compete to be the new ''standby'' Router.		The Virtual Router is a MAC-address and a IP Address the ''active'' Router serves beside its configured IP address. If the ''active'' Router fails the ''standby'' Router becomes the Virtual Router by serving the virtual MAC-address and IP Address. If there are any Routers in ''speak'' state they will compete to be the new ''standby'' Router.
		+
		+	If more than two Routers participate in a HSRP group the remaining Routers will be in Listen State. (See [https://tools.ietf.org/html/rfc2281#section-5.3 RFC 2281 Section 5.3]) There can be an arbitrary number of Routers in a HSRP group. (See [https://tools.ietf.org/html/rfc2281#section-1 RFC 2281 section 1]

	== HSRP example ==		== HSRP example ==

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 =Links=
 *[http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/sweot.html#wp1084432 Configuring Enhanced Object Tracking] (3560)
+*[https://packetpushers.net/ccnp-studies-configuring-hsrp-part-two/ Configuring HSRP in the distribution layer]
 [[Category:Cisco]] [[Category:CCNP]] [[Category:IOS]] [[Category:Network]] [[Category:CCNP3]]

← Older revision		Revision as of 04:12, 20 June 2014
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	It is important to track the access interfaces.See Picture 2 below. Under normal operations where both WANS between the buildings are operational the ''active'' router routes packets between the buildings. If the WAN connected to the ''active'' Router fails the active Router should withdraw as ''active'' Router and let the ''standby'' Router take over. See Picture 3. Thats called ''tracking interfaces'''		It is important to track the access interfaces.See Picture 2 below. Under normal operations where both WANS between the buildings are operational the ''active'' router routes packets between the buildings. If the WAN connected to the ''active'' Router fails the active Router should withdraw as ''active'' Router and let the ''standby'' Router take over. See Picture 3. Thats called ''tracking interfaces'''
		+
		+	Enhanced tracking possible on some platforms. See links below.

	[[Image:Hsrp access line 1.png\|thumb\|left\|400px]]		[[Image:Hsrp access line 1.png\|thumb\|left\|400px]]

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 '''Dormant''' - interface has no HSRP groups, single advertisements sent once when last group is removed <br>'''Passive''' - interface has at least one non-active group and no active groups, advertisements sent out periodically <br>'''Active''' - interface has at least one active group, single advertisement sent out when first group becomes active
+=Links=
 [[Category:Cisco]] [[Category:CCNP]] [[Category:IOS]] [[Category:Network]] [[Category:CCNP3]]

@@ Line 209: / Line 209: @@
 '''Passive HSRP Router Advertisements (opcode = 3)'''
-Passive HSRP routers send out HSRP advertisement messages both periodically, and when entering or leaving the passive state. Thus, all HSRP routers can determine the HSRP group state of any HSRP router on the&nbsp;network. These advertisements inform other HSRP routers on the network of the HSRP interface state:
+<br>
 '''Dormant''' - interface has no HSRP groups, single advertisements sent once when last group is removed <br>'''Passive''' - interface has at least one non-active group and no active groups, advertisements sent out periodically <br>'''Active''' - interface has at least one active group, single advertisement sent out when first group becomes active

@@ Line 197: / Line 197: @@
-= Note =
+= Note  =
 HSRP version 0 Brugere en opcode som ikke er beskrevet i RFC 2281, Nemlig opcode 3
 <br>
 Her er et indlæg fra et forum om det:
 Here are some clippings from it. Cisco seems to have added this <br>opcode as part of the feature "HSRP Support for ICMP Redirects":
 '''Passive HSRP Router Advertisements (opcode = 3)'''
 Passive HSRP routers send out HSRP advertisement messages both periodically, and when entering or leaving the passive state. Thus, all HSRP routers can determine the HSRP group state of any HSRP router on the&nbsp;network. These advertisements inform other HSRP routers on the network of the HSRP interface state:
 '''Dormant''' - interface has no HSRP groups, single advertisements sent once when last group is removed <br>'''Passive''' - interface has at least one non-active group and no active groups, advertisements sent out periodically <br>'''Active''' - interface has at least one active group, single advertisement sent out when first group becomes active
 [[Category:Cisco]] [[Category:CCNP]] [[Category:IOS]] [[Category:Network]] [[Category:CCNP3]]