Jack's Test: Arista MLAG

개요

서로 다른 장비와 LACP 구성을 할 수 있어서 Link redundancy 뿐만 아니라 Node redundancy를 지원한다.
전체적으로는 Loop 구성이지만 STP로 인한 Block port가 발생하지 않아서 Bandwidth 효율성을 높일 수 있다.

Test Env.

Aboot-veos-8.0.0.iso
vEOS-lab-4.16.6M.vmdk
GNS3 VM 1.4.6 (6 CPU, 6 GB Mem)

4 x vEOS (QEMU, 1,280 MB Mem)
1 x Ostinato (256 MB Mem)

사전준비

GNS3 VM를 이용해서 vEOS를 QEMU로 생성하도록 한다.

Test

두 MLAG Switch간에 priority에 따라서 mlag sys-id를 선출한다.

MLAG-1의 lacp system-id

MLAG-2의 lacp system-id

이같이 선출된 mlag sys-id는 lacp-1, lacp-2 switch와 LACP를 맺을 때 system-id로 사용된다. 결국 LACP Switch는 동일한 system-id를 가진 PDU를 수신하게 된다.

LACP-1 e1 포트에서 tcpdump

MLAG-1이 보낸 PDU를 보면 Actor system id를 "00:00:ab:85:37:5e"로 보내고 있다.

LACP-1 e2 포트에서 tcpdump

MLAG-2이 보낸 PDU를 보면 Actor system id를 "00:00:ab:85:37:5e"로 보내고 있다.

MLAG-1 에서 show

절체

Iinitial traffic flow

1->2->6->8
8->6->2->1

Link 1 절체

1->3->7>8
8->6->4->3->1

Link 4 절체

1->3->7->8
8->6->5->3->1

Configuration

MLAG-1

! Command: show running-config
! device: mlag-1 (vEOS, EOS-4.16.6M)
!
! boot system flash:/vEOS-lab.swi
!
transceiver qsfp default-mode 4x10G
!
hostname mlag-1
!
spanning-tree mode mstp
no spanning-tree vlan 4094
!
no aaa root
!
vlan 30
!
vlan 4094
trunk group mlagpeer
!
interface Port-Channel3
switchport mode trunk
mlag 3
!
interface Port-Channel4
switchport mode trunk
mlag 4
!
interface Port-Channel10
switchport mode trunk
switchport trunk group mlagpeer
!
interface Ethernet1
channel-group 10 mode active
!
interface Ethernet2
channel-group 10 mode active
!
interface Ethernet3
channel-group 3 mode active
!
interface Ethernet4
channel-group 4 mode active
!
interface Management1
!
interface Vlan4094
no autostate
ip address 10.0.0.1/30
!
no ip routing
!
mlag configuration
domain-id mlag1
local-interface Vlan4094
peer-address 10.0.0.2
peer-link Port-Channel10
!
!
end

MLAG-2

! Command: show running-config
! device: mlag-2 (vEOS, EOS-4.16.6M)
!
! boot system flash:/vEOS-lab.swi
!
transceiver qsfp default-mode 4x10G
!
hostname mlag-2
!
spanning-tree mode mstp
no spanning-tree vlan 4094
!
no aaa root
!
vlan 30
!
vlan 4094
trunk group mlagpeer
!
interface Port-Channel3
switchport mode trunk
mlag 3
!
interface Port-Channel4
switchport mode trunk
mlag 4
!
interface Port-Channel10
switchport mode trunk
switchport trunk group mlagpeer
!
interface Ethernet1
channel-group 10 mode active
!
interface Ethernet2
channel-group 10 mode active
!
interface Ethernet3
channel-group 3 mode active
!
interface Ethernet4
channel-group 4 mode active
!
interface Management1
!
interface Vlan4094
no autostate
ip address 10.0.0.2/30
!
no ip routing
!
mlag configuration
domain-id mlag1
local-interface Vlan4094
peer-address 10.0.0.1
peer-link Port-Channel10
!
!
end

LACP-1

! Command: show running-config

! device: lacp-1 (vEOS, EOS-4.16.6M)

! boot system flash:/vEOS-lab.swi

transceiver qsfp default-mode 4x10G

hostname lacp-1

spanning-tree mode mstp

no aaa root

vlan 30

interface Port-Channel3

switchport mode trunk

interface Ethernet1

channel-group 3 mode active

interface Ethernet2

channel-group 3 mode active

interface Ethernet3

switchport access vlan 30

interface Ethernet4

interface Management1

no ip routing

end

LACP-2