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aka: MultiChassis-LAG, MC-LAG, MLAG, DRNI, Distributed Resilient Network Interconnect
| Configuration | link to documentation |
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| MC-LAG : share a common LAG endpoint ( the other endpoint is the server,CPE ) |
| Intra-Domain-Link (IDL) | to synchronize the states between both routers via MCEC packets No data traffic is carried over the IDP |
| Intra-Domain-Peer (IDP) | to synchronize the states between both routers Layer 3 communication path to carry MCEC packets. No data traffic is carried over the IDP |
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| Drawing | Link to drawing |
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| R5 and R6 config example |
| Code Block |
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| R5LAB
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hardware-profile filter egress-l2 enable
interface ce1
switchport
description "R5-R6 peer-link or line between mlag domain"
mcec domain configuration
domain-address 1111.2222.3333
domain-system-number 1
intra-domain-link ce1
domain-hello-timeout short
bridge 1 protocol rstp vlan-bridge
vlan 2 bridge 1 state enable
interface mlag1
bridge-group 1 spanning-tree disable
switchport
switchport mode trunk
switchport trunk allowed vlan all
interface mlag1
mode active-active
>>> commit
interface po1
switchport
mlag 1
interface xe10
channel-group 1 mode active
=========================================
R6LAB:
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hardware-profile filter egress-l2 enable
interface ce1
switchport
description "R5-R6 peer-link or line between mlag domain"
mcec domain configuration
domain-address 1111.2222.3333
intra-domain link ce1
domain-system-number 2
domain-hello-timeout short
. . . |
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| commands | link to documentation |
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| LAG or po | po port channel or link aggregation LAG |
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| show commands |
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| show mcec statistics
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| show mlag domain summary | Code Block |
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| title | show mlag |
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| collapse | true |
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| R5LAB#show mlag domain summary
------------------------------------
Domain Configuration
------------------------------------
Domain System Number : 1
Domain Address : 1111.2222.3333
Domain Priority : 32768
Intra Domain Interface : ce1
Domain Adjacency : UP
MCEC PDU local version : 1
MCEC PDU peer version : 1
Domain Sync via : Intra-domain-interface
Peer SVI interface MAC Address : E8.C5.7A.2E.50.1B
------------------------------------
MLAG Configuration
------------------------------------
MLAG-1
Mapped Aggregator : po1
Physical properties Digest : 54 a9 3a 2a 2b 50 65 bb 3c bc 3d bd c2 43 d6 22
Total Bandwidth : 20g
Mlag Sync : IN_SYNC
Mode : Active-Active
Current Mlag state : Active
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| show etherchannel summary | Code Block |
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| title | show etherchannel |
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| collapse | true |
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| R5LAB#show etherchannel summary
Aggregator po1 100001
Aggregator Type: Layer2
Parent Aggregator : Active mlag1
Admin Key: 16385 - Oper Key 16385
Link: xe10 (5011) sync: 1 (Mlag-active-link) |
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| show port etherchannel po1 | Code Block |
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| title | show port etherchannel |
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| collapse | true |
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| R5LAB#show port etherchannel po1
LAG ID : 0x8000,11-11-22-22-33-33,0x4001
Partner oper LAG ID : 0x8000,e8-c5-7a-08-ee-1c,0x0001
Aggregator ID : 100001
LACP link info : xe10 - 5011
Periodic Transmission
machine state : Slow periodic
Receive machine state : Current
Mux machine state : Collecting/Distributing
Actor Info :
===========
Actor Port priority : 0x8000 (32768)
Admin key : 0x4001 (16385) Oper key: 0x4001 (16385)
Physical admin key : (1)
Actor Oper state : ACT:1 TIM:0 AGG:1 SYN:1 COL:1 DIS:1 DEF:0 EXP:0
Actor Admin state : ACT:1 TIM:0 AGG:1 SYN:0 COL:0 DIS:0 DEF:1 EXP:0
Partner Info:
============
Partner oper port : 10018
Partner link info : admin port 0
Partner admin LAG ID : 0x0000-00:00:00:00:0000
Partner system priority : admin:0x0000 - oper:0x8000
Partner port priority : admin:0x0000 - oper:0x8000
Partner oper state : ACT:1 TIM:0 AGG:1 SYN:1 COL:1 DIS:1 DEF:0 EXP:0
Partner admin state : ACT:0 TIM:0 AGG:1 SYN:0 COL:0 DIS:0 DEF:1 EXP:0
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| show bridge rstp | Code Block |
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| title | show bridge |
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| collapse | true |
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| R5LAB#show bridge rstp
Ageout time is global and if something is configured for vxlan then it will be affected here also
Bridge CVLAN SVLAN BVLAN Port MAC Address FWD Time-out
---------+------+------+------+-----------+-----------------+-----+---------+
1 1 mlag1 e8c5.7afa.f22f 1 300
1 1 ce1 e8c5.7afa.f231 1 300
1 1 mlag1 e8c5.7afa.f23c 1 300
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| show vlan all bridge 1 | Code Block |
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| R5LAB# show vlan all bridge 1
Bridge VLAN ID Name State H/W Status Member ports
(u)-Untagged, (t)-Tagged
======= ======= ================ ======= ========== ==========================
1 1 default ACTIVE Success ce1(u) mlag1(u) po1(u)
xe10(u) xe15(u)
1 2 VLAN0002 ACTIVE Success ce1(t) mlag1(t) po1(t)
xe10(t)
1 240 VLAN0240 ACTIVE Success ce1(t) mlag1(t) po1(t)
xe10(t)
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