Actions
How to configure Arista switches¶
- Table of contents
- How to configure Arista switches
- Saving your changes
- Entering conf mode
- Setting password
- Setting name
- Creating a VLAN
- Putting a port into a untagged vlan
- Creating a port channel (= LACP = bonding)
- Creating a port channel over multiple switches using MLAG
- Upgrading a switch
- Configuring MLAG
- Combining (MLAG+nolacp) + (Trunk+untagged vlan fallback)
- Configuring BGP
Saving your changes¶
If you don't enter write at the end, everything is lost after reboot.
write
Entering conf mode¶
enable conf
Setting password¶
username admin secret <passwordhere>
Setting name¶
hostname <NAME>
By default set it to switch-placeX. While the placeX part is indeed redundant, it is necessary to be able to distinguish switch1.place5 and switch1.place6.
Creating a VLAN¶
vlan <ID-OF-VLAN> name <NAME-OF-VLAN>
Putting a port into a untagged vlan¶
interface EthernetXX switchport access vlan YY
Creating a port channel (= LACP = bonding)¶
- go to the interface that you want to be in the port-channel
- configure it
interface EthernetXX channel-group XX mode active
Creating a port channel over multiple switches using MLAG¶
interface EthernetXX channel-group XX mode active interface port-channel XX mlag XX
And if you want to have tagged/trunk port:
switchport mode trunk
If you want to have untagged connections to be automatically tagged:
switchport trunk native vlan <VLAN>
If you want to allow fallback of lacp:
port-channel lacp fallback static port-channel lacp fallback timeout 20
Upgrading a switch¶
- copy the image from usb to flash
- change the boot config
- don't forget to write
- reload
copy usb1:/EOS-4.14.4.swi flash:/EOS-4.14.4.swi configure terminal boot system flash:/EOS-4.14.4.swi show boot-config write reload
Configuring MLAG¶
- Create a port channel for communication
- Configure the mlag over it
- Assuming the switches are connected by ethernet 47 and ethernet 48
- Assuming that the switches use vlan 13
- ZZ = ip suffix of the switch
- WW = ip suffix of the other switch
- mlagdomain = something local
interface ethernet 47 channel-group 47 mode active interface ethernet 48 channel-group 47 mode active interface Port-Channel47 switchport mode trunk switchport trunk group mlag-aristas vlan 13 name mlag-aristas trunk group mlag-aristas interface Vlan13 no autostate ip address 10.3.4.ZZ/24 mlag configuration domain-id MLAGLOCALDOMAIN peer-address 10.3.4.WW local-interface Vlan13 peer-link Port-Channel47
Combining (MLAG+nolacp) + (Trunk+untagged vlan fallback)¶
- Allow servers to netboot
- Without LACP active
- Without VLAN tagging active
Configuration valid for both switches:
interface Port-Channel1 switchport trunk native vlan 10 switchport mode trunk port-channel lacp fallback static port-channel lacp fallback timeout 20 mlag 1 ! interface Ethernet1 channel-group 1 mode active
Configuring BGP¶
- XX = ip suffix
router bgp 209898 router-id 0.0.0.XX bgp default ipv6-unicast maximum-paths 4 bgp listen range 2a0a:e5c0:1:8::/64 peer-group ungleich remote-as 209898 neighbor ungleich peer-group neighbor ungleich maximum-routes 12000
Updated by Nico Schottelius over 2 years ago · 15 revisions