Dell S4048-ON EMC Networking with Isilon Front-End Deployment and Best Practic - Page 30
enables ECMP.
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S4048-ON Leaf 1 uplink-state-group 1 enable downstream port-channel1 downstream port-channel3 downstream port-channel5 downstream port-channel101 downstream port-channel102 upstream ethernet1/1/49 upstream ethernet1/1/50 S4048-ON Leaf 2 uplink-state-group 1 enable downstream port-channel1 downstream port-channel3 downstream port-channel5 downstream port-channel101 downstream port-channel102 upstream ethernet1/1/49 upstream ethernet1/1/50 Use these commands to configure eBGP. First, enable eBGP with the router bgp ASN command. The ASN is from Figure 14. The bgp bestpath as-path multipath-relax enables ECMP. The maximum-paths ebgp 2 command specifies the maximum number of parallel paths to a destination to add to the routing table. In this topology, there are two equal cost best paths from a spine to a host, one to each leaf that the host is connected. BGP neighbors are configured, and Neighbor fall-over is enabled. Graceful restart enables the data plane to continue forwarding traffic for a time if the BGP process fails or quits. BGP hello and hold down timers are set to three and nine seconds, respectively. Neighbor fall-over will trigger route withdrawal when IP connectivity between BGP peers is lost. The more aggressive timers (default is 60 seconds hello and 180 seconds hold down) are for backup. The advertisement interval is set to one second. This is to prevent BGP speakers from advertising updates immediately upon receipt. Instead, they will advertise them in batched intervals of one second. This delay is to prevent overhead. Finally, exit configuration mode and save the configuration. 30 Dell EMC Networking with Isilon Front-End Deployment and Best Practices Guide | version 1.0