Dell PowerEdge R730xd Deployment Manual

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Dell PowerEdge R730xd Deployment Manual Manual pdf 16 page image

16 Dell EMC Networking with Isilon Front-End Deployment and Best Practices Guide | version 1.05 Layer 3 Topology preparationThe layer 3 topology used in this example will use external border gateway protocol (eBGP) as well as ECMP.In order to correctly configure this topology, several things need to be considered and planned.5.1 BGP ASN configurationWhen eBGP is used, an autonomous system number (ASN) is assigned to each switch. Valid private, 2-byteASNs range from 64512 through 65534. Figure 14 shows the ASN assignments used for leaf and spineswitches in the BGP examples in this guide.BGP ASN assignmentsASNs should follow a logical pattern for ease of administration and allow for growth as additional leaf andspine switches are added. In this example, an ASN with a “6” in the hundreds place represents a spine switch(e.g., 64601), and an ASN with a “7” in the hundreds place represents a leaf switch (e.g., 64701).Note: The same ASN can be used across all tier-2 spine switches if the growth plans do not require anadditional layer of spine switches.5.2 Loopback addressesLoopback addresses may be used as router IDs when configuring routing protocols. As with ASNs, loopbackaddresses should follow a logical pattern that will make it easier for administrators to manage the network andallow for growth. Figure 15 shows the loopback addresses used as router IDs in the example provided.