<?xml version='1.0'?>

<reference anchor='RFC2281'>

<front>
<title abbrev='Cisco HSRP'>Cisco Hot Standby Router Protocol (HSRP)</title>
<author initials='T.' surname='Li' fullname='Tony Li'>
<organization>Juniper Networks, Inc.</organization>
<address>
<postal>
<street>3260 Jay St.</street>
<street>Santa Clara</street>
<street>CA 95054</street></postal>
<phone>(408) 327-1900</phone>
<email>tli@juniper.net</email></address></author>
<author initials='B.' surname='Cole' fullname='Bruce Cole'>
<organization>Juniper Networks, Inc.</organization>
<address>
<postal>
<street>3260 Jay St.</street>
<street>Santa Clara</street>
<street>CA 95054</street></postal>
<phone>(408) 327-1900</phone>
<email>cole@juniper.net</email></address></author>
<author initials='P.' surname='Morton' fullname='Phil Morton'>
<organization>Cisco Systems</organization>
<address>
<postal>
<street>170 Tasman Dr.</street>
<street>San Jose</street>
<street>CA 95143</street></postal>
<phone>(408) 526-7632</phone>
<email>pmorton@cisco.com</email></address></author>
<author initials='D.' surname='Li' fullname='Dawn Li'>
<organization>Cisco Systems</organization>
<address>
<postal>
<street>170 Tasman Dr.</street>
<street>San Jose</street>
<street>CA 95143</street></postal>
<phone>(408) 527-2014</phone>
<email>dawnli@cisco.com</email></address></author>
<date month='March' year='1998' />
<area>Routing</area>
<keyword>router</keyword>
<keyword>routing</keyword>
<abstract>
<t>
   This document reflects an existing deployed protocol.  The IETF does
   have a working group which is in the process of producing a standards
   track protocol to address the same issues.
</t>
<t>
   The memo specifies the Hot Standby Router Protocol (HSRP).  The goal
   of the protocol is to allow hosts to appear to use a single router
   and to maintain connectivity even if the actual first hop router they
   are using fails.  Multiple routers participate in this protocol and
   in concert create the illusion of a single virtual router.  The
   protocol insures that one and only one of the routers is forwarding
   packets on behalf of the virtual router.  End hosts forward their
   packets to the virtual router.
</t>
<t>
   The router forwarding packets is known as the active router.  A
   standby router is selected to replace the active router should it
   fail. The protocol provides a mechanism for determining active and
   standby routers, using the IP addresses on the participating routers.
   If an active router fails a standby router can take over without a
   major interruption in the host&apos;s connectivity.  This memo also
   discusses the ARP, MAC address, and security issues with this
   protocol.
</t></abstract>
<note title='IESG Note'>
<t>
   This document reflects an existing deployed protocol.  The IETF does
   have a working group which is in the process of producing a standards
   track protocol to address the same issues.
</t></note></front>

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