L3 redundancy.pdf - the Netgroup at Politecnico di Torino

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VRRP overview (3)• Major (?) differences• Each master VRRP router can control more than one IP Address• A VRRP Router may backup one or more virtual routers• Any of the virtual router's IP addresses on a LAN can then beused as the Default Gateway by end-hosts• Support multiple logical IP subnets on a single LAN segment• For any VRID a single Master Router is elected the remainingrouters are selected as Backup Routers (no longer routers in“Listen”)• Only the Master router sends Advertisement packets• The master router may have the same address as the groupvirtual router address• “tracking” not available• “preempt” is the specified behavior41
VRRP: packet format (1)MACheaderIP header VRRP FCS0 8 16 24 31Ver= 2 Type= 1 Virtual Router ID Priority Count IP addr.Auth Type Advert Interval ChecksumVirtual IP address 1Virtual IP address NAuthentication data (1)Authentication data (2)42
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 36 and 37: HSRP: “track” function (2)•
Page 38 and 39: VRRP overview (1)• A “smart”
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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