L3 redundancy.pdf - the Netgroup at Politecnico di Torino

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HSRP: the ideaH1DG: 2.2.2.4H2DG: 2.2.2.4H3DG: 2.2.2.4ARP Request: who hasIP 2.2.2.4?ARP Reply: IP 2.2.2.4 is atMAC 00:00:00:44:44:44“Hello” packetsR3 (active)IP: 2.2.2.3MAC: 00:00:00:33:33:33HSRP Group: 4Virtual IP: 2.2.2.4Virtual MAC: 00:00:00:44:44:44R2 (stand-by)IP: 2.2.2.2MAC: 00:00:0:22:22:22R1 (listen)IP: 2.2.2.1MAC: 00:00:00:11:11:11HSRP Group: 4Internet7
HSRP: working operations (1)• Routers that provide redundancy belong to the same “group”• Each group emulates a single virtual router• Routers can be• Active: the one that has the right to serve the LAN• Stand-by: the one that takes place in case the Active fails• Listen: the others that are neither Active nor Stand-by• May become stand-by in case the active fails• Within each group, we define two additional (shared)addresses• A virtual IP address• A virtual MAC address8
Page 1 and 2: Redundancy and load balancing at L3
Page 3 and 4: Default gateway redundancy (2)• O
Page 5: 昨年開催の様子© 吉
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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