Deployment Guide
Table Of Contents
- 1 Introduction
- 2 Hardware overview
- 3 Leaf-spine overview
- 4 Protocols used in the leaf-spine examples
- 5 Layer 3 configuration planning
- 6 Example 1: Layer 3 with Dell EMC leaf and spine switches using OSPF
- 7 Example 2: Layer 3 with Dell EMC leaf and spine switches using eBGP
- A Dell EMC Networking ONIE switch factory default settings
- B Validated hardware and operating systems
- C Technical support and resources
- D Support and Feedback
32 Dell EMC Networking Layer 3 Leaf-Spine Deployment and Best Practices with OS10 | Version 1.0
Internal Use - Confidential
description "Disable downstream ports
in event all uplinks fail"
downstream port-channel 10
upstream ethernet 1/1/25
upstream ethernet 1/1/26
enable
description "Disable downstream ports
in event all uplinks fail"
downstream port-channel 10
upstream ethernet 1/1/25
upstream ethernet 1/1/26
enable
Use these commands to configure eBGP.
First, enable eBGP with the router bgp ASN command. The ASN is from Figure 9.
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.
S4148F-Leaf1
S4148F-Leaf2
router bgp 64701
bestpath as-path multipath-relax
maximum-paths ebgp 2
address-family ipv4 unicast
redistribute connected route-map
spine-leaf
exit
graceful-restart role receiver-only
template spine-leaf
fall-over
advertisement-interval 1
timers 3 9
exit
neighbor 192.168.1.0
remote-as 64601
inherit template spine-leaf
no shutdown
exit
neighbor 192.168.2.0
remote-as 64602
router bgp 64702
bestpath as-path multipath-relax
maximum-paths ebgp 2
address-family ipv4 unicast
redistribute connected route-map
spine-leaf
exit
graceful-restart role receiver-only
template spine-leaf
fall-over
advertisement-interval 1
timers 3 9
exit
neighbor 192.168.1.2
remote-as 64601
inherit template spine-leaf
no shutdown
exit
neighbor 192.168.2.2
remote-as 64602