L3 redundancy.pdf - the Netgroup at Politecnico di Torino

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HSRP: “track” function (2)• “Track” the status of the physical layer on the interface• Dynamically decrease the HSRP Priority when a tracked interfacegoes down• By default HSRP algorithm decrease the Priority by 10 when thelink-layer of a tracked interface goes down• Be careful: only some types of faults cause the interface togo down• E.g. an interface will stay up if connected to an active L2 switchR1R2 (WAN)HSRPR337
HSRP: advanced configurationR1(config)# interface ethernet 0R1(config-if)# ip address 10.1.1.1 255.255.255.0R1(config-if)# standby 1 ip 10.1.1.5R1(config-if)# standby 1 priority 105R1(config-if)# standby 1 preemptR1(config-if)# standby 1 track Serial0R1(config-if)# standby 2 ip 10.1.1.6R1(config-if)# standby 2 preemptR1(config-if)# standby 2 track Serial0R2(config)# interface ethernet 0R2(config-if)# ip address 10.1.1.2 255.255.255.0R2(config-if)# standby 1 ip 10.1.1.5R2(config-if)# standby 1 preemptR2(config-if)# standby 1 track Serial0R2(config-if)# standby 2 ip 10.1.1.6R2(config-if)# standby 2 priority 105R2(config-if)# standby 2 preemptR2(config-if)# standby 2 track Serial0H1DG: 10.1.1.5H2DG: 10.1.1.5R1HSRP Group 1 (active)HSRP Group 2 (standby)R2HSRP Group 1 (standby)HSRP Group 2 (active)Internet38
Page 1 and 2: Redundancy and load balancing at L3
Page 3 and 4: Default gateway redundancy (2)• O
Page 5 and 6: 昨年開催の様子© 吉
Page 7 and 8: HSRP: working operations (1)• Rou
Page 10: HSRP: working operations (4)• Kee
Page 13 and 14: HSRP Encapsulation• HSRP packets
Page 15 and 16: HSRP header: “state” field (1)
Page 17 and 18: HSRP header: “Hello time” and
Page 19 and 20: HSRP header: Authentication and Vir
Page 21 and 22: HSRP: fault reactionH1DG: 2.2.2.3H2
Page 23 and 24: HSRP and interfaces (2)• HSRP can
Page 25 and 26: HSRP and VLANs• Each VLAN is a se
Page 27 and 28: HSRP and ARP caches• A gratuitous
Page 29 and 30: HSRP and load sharing (1)H1DG: 2.2.
Page 31 and 32: HSRP and load sharing (3)• Proble
Page 33 and 34: HSRP: Preemption capability• Para
Page 38 and 39: VRRP overview (1)• A “smart”
Page 40 and 41: VRRP overview (3)• Major (?) diff
Page 42 and 43: VRRP: packet format (2)• IP heade
Page 44 and 45: VRRP: packet format (4)• Count IP
Page 46 and 47: VRRP: Virtual MAC Address• Well k
Page 48 and 49: HSRP/VRRP: convergence• HSRP: abo
Page 50 and 51: HSRP/VRRP on real LANs: L2 resilien
Page 52 and 53: HSRP/VRRP on real LANs: flooding (2
Page 54 and 55: HSRP/VRRP on real LANs: flooding (4
Page 56 and 57: HSRP/VRRP on unidirectional links (
Page 58 and 59: GLBP• Enhancement (and replacemen
Page 60 and 61: GLBP Functions• Active Virtual Ga
Page 62 and 63: Load Balancing Algorithm• Four po

L3 redundancy.pdf - the Netgroup at Politecnico di Torino

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