L3 redundancy.pdf - the Netgroup at Politecnico di Torino
L3 redundancy.pdf - the Netgroup at Politecnico di Torino
L3 redundancy.pdf - the Netgroup at Politecnico di Torino
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HSRP/VRRP on real LANs: floo<strong>di</strong>ng (1)• Switches may have incomplete filtering d<strong>at</strong>abase• Some entries may be missing, due to <strong>the</strong> Aging Time• If a frame <strong>di</strong>rected to th<strong>at</strong> host is received, <strong>the</strong> frame is flooded• A perio<strong>di</strong>c gener<strong>at</strong>ion of broadcast frames avoids <strong>the</strong> problem• Some hosts gener<strong>at</strong>e a limited number of broadcasts (e.g. UNIXor VmWare)• Sometimes ARP messages are sent only “occasionally” on <strong>the</strong>network• ARP cache is often 5 minutes or more• Max Ageing Time in <strong>the</strong> filtering d<strong>at</strong>abase is often 2 minutes52
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