Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 397
Enable and Disable VLAN Flooding,
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As shown in Figure 20-5, the server MAC address is given in the Ethernet frame header of the ARP reply, while the virtual MAC address representing the cluster is given in the payload. The vlan-flooding command directs the system to discover that there are different MAC addresses in an ARP reply and associate the virtual MAC address with the VLAN connected to the cluster. Then, all traffic destined for the cluster is flooded out of all member ports. Since all of the servers in the cluster receive traffic, failover and balancing are preserved. Figure 20-5. Server Cluster: Failover and Balancing Preserved with the vlan-flooding Command Source MAC: MACS1 Destination MAC: MACClient Type: 0x0806 Source IP: IPS1 Source MAC: MACCluster Pad CRC Microsoft Server Cluster: IPCluster MACCluster Server1: IPS1 MACS1 Server2: IPS2 MACS2 Server3: IPS3 MACS3 Ethernet Frame Header VLAN 1 ARP Reply Client Data Server4: IPS4 MACS4 vlan-flooding configured fnC0029mp Enable and Disable VLAN Flooding • ARP entries already resolved through the VLAN are deleted when the feature is enabled. This ensures that ARP entries across the VLAN are consistent. • All ARP entries learned after the feature is enabled are deleted when the feature is disabled, and RP2 triggers ARP resolution. The feature is disabled with the command no vlan-flooding. • When a port is added to the VLAN, the port automatically receives traffic if the feature is enabled. Old ARP entries are not deleted or updated. • When a member port is deleted, its ARP entries are also deleted from the CAM. • Port channels in the VLAN also receive traffic. • There is no impact on the configuration from saving the configuration. • The feature is not reflected in the output of the show arp command but is reflected in the output of the command show ipf fib. The ARP entries exist in the secondary RPM CAM, so failover has no effect on the feature. Layer 2 | 397
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