Cisco to Arista EOS Migration Cheat Sheet

2026年8月28日 LOG admin

If your team knows Cisco IOS, learning Arista EOS is mostly a matter of mapping familiar commands to their EOS equivalents. Because EOS ships a Cisco-style CLI, many show commands are identical, but there are important differences — show processes top once instead of show process cpu, no DTP, VRRP instead of HSRP, and Linux-based bash access for deep troubleshooting. This cheat sheet condenses the essential command mapping so migration and daily operation go smoothly.

System and Process Commands

Cisco IOS	Arista EOS
show memory	show system memory / bash -c "free -m"
show process cpu	show processes top once
dir /all	bash -c "ls -al /mnt/flash"
show flash	bash -c "df -h" or dir
erase startup-config	delete startup-config
copy nvram:startup-config tftp	copy startup-config tftp://host/file

L2 and VLAN Commands

Cisco IOS	Arista EOS
show vlan brief	show vlan
show interfaces trunk	show interfaces switchport
show etherchannel summary	show port-channel summary
show cdp neighbors detail	show lldp neighbors detail
switchport mode dynamic	DTP not supported

L3 and Routing Commands

Cisco IOS	Arista EOS
show ip ospf neighbor	show ip ospf neighbor (same)
show ip route	show ip route (same)
show standby (HSRP)	show vrrp (VRRP)
show ip access-lists	show access-lists
show ip ssh	show management ssh

Architecture Differences That Matter

OS model: IOS is a proprietary monolithic OS; EOS is modular, built on Fedora Linux with independent multi-process agents.
Failure handling: a feature failure can crash an IOS device; in EOS a process restarts without taking the switch down.
CLI parity: the EOS CLI deliberately mimics Cisco IOS — show running-config, show interfaces, show ip interface brief, ping, and traceroute work the same on both.
Debugging depth: EOS exposes a real bash shell, so standard Linux tools (ps, strace, tcpdump) are first-class troubleshooting tools.

For hands-on EOS configuration, continue with our EOS VLAN, trunk and port-channel guide, the EOS troubleshooting cookbook, and the multi-vendor CLI cheat sheet covering IOS XR, Junos, SR OS and VRP.

原文链接：https://cisconetsolutions.com/arista-eos-migration-cheat-sheet

作者：admin

链接：https://gitgit.ee/cisco-arista-eos-command-cheat-sheet.html

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