Redundancia Cisco

FIRST HOP REDUNDANCY
Protocols Hot Standby Router Protocol (HSRP)
Provides default gateway redundancy using one active and one standby router; standardized but licensed by Cisco Systemspacketlife.net
Attributes
HSRP VRRP GLBP

Standard RFC 2281 Load Balancing No IPv6 Support Yes Transport UDP/1985 Default Priority 100

RFC 3768 No No IP/112 100 1 sec 224.0.0.18 GLBP

Cisco Yes YesUDP/3222 100 3 sec 224.0.0.102

Virtual Router Redundancy Protocol (VRRP) An open-standard alternative to Cisco's HSRP, providing the same functionality Gateway Load Balancing Protocol (GLBP)Supports arbitrary load balancing in addition to redundancy across gateways; Cisco proprietary HSRP
100 200 100 100

Default Hello 3 sec Multicast Group 224.0.0.2 VRRP
200 100 100

200

100Standby

Active

Listen

Backup

Master

Backup

AVF

AVF AVG

AVF

HSRP Configuration
interface FastEthernet0/0 ip address 10.0.1.2 255.255.255.0 standby version {1 | 2} standby 1 ip10.0.1.1 standby 1 timers standby 1 priority standby 1 preempt standby 1 authentication md5 key-string standby 1 track standby 1 track decrement

HSRP/GLBP Interface States Speak Active Gatewayelection in progress Active router/VG Backup router/VG

Standby Listen

Not the active router/VG VRRP Interface States

Master Backup

Acting as the virtual router All non-master routers GLBPRoles

VRRP Configuration
interface FastEthernet0/0 ip address 10.0.1.2 255.255.255.0 vrrp 1 ip 10.0.1.1 vrrp 1 timers {advertise | learn} vrrp 1 priority vrrp 1 preempt vrrp 1 authenticationmd5 key-string vrrp 1 track decrement

Active Virtual Gateway (AVG) Answers for the virtual router and assigns virtual MAC addresses to group members Active Virtual Forwarder (AVF) All routerswhich forward traffic for the group GLBP Load Balancing Round-Robin (default) The AVG answers host ARP requests for the virtual router with the next router in the cycle Host-Dependent Round-robin...