L3 redundancy.pdf - the Netgroup at Politecnico di Torino

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Default gateway redundancy (1)H1DG: R1H2DG: R1H3DG: R1R1R2ISP1ISP2Internet3
Default gateway redundancy (2)• Objective• Provide redundancy of the default gateway• Two routers on the LAN are useless if hosts are not able toswitch to another one in case the first fails• Hosts on the LAN are not able to learn the network topologythrough Layer 3 routing protocols• Please note that incoming traffic (from the Internet to theLAN) will arrive correctly, even if one router fails• We are having troubles only in the opposite direction4
Page 1: Redundancy and load balancing at L3
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 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
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L3 redundancy.pdf - the Netgroup at Politecnico di Torino

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