Dynamic LAG Minimum Bandwidth Configuration
Configure the minimum bandwidth allowed for ports that must be linked up and bundled in the LACP port channel. We can configure the minimum bandwidth range from BANDWIDTH <1-999>k|m for 1 to 999 kilo bits or mega bits <1-1000>g for 1 to 1000 giga bits. If the Total bandwidth of ports aggregated to the port channel is less than the minimum Bandwidth value configured, then the port channel enters the Protocol Down because of the minimum Bandwidth state.
Note: Minimum Bandwidth should be configured the same on both sides for optimal performance.
Topology
Figure 8-12: LAG Minimum Bandwidth
SW1
#configure terminal | Enter configure mode. |
(config)#interface po10 | Creating interface port-channel po10 |
(config-if)#port-channel min-bandwidth 40g | Configuring port channel minimum bandwidth as 40g (range from BANDWIDTH <1-999>k|m for 1 to 999 kilo bits or mega bits <1-1000>g for 1 to 1000 giga bits.) |
(config-if)#end | Exit the configure mode |
Validation
SW1
#sh running-config interface po10
interface po10
switchport
bridge-group 1
switchport mode trunk
switchport trunk allowed vlan all
port-channel min-bandwidth 40g
!
!
#show etherchannel
------------------------------------
% Lacp Aggregator: po10
% Min-Bandwidth : 40g
% Member:
xe4/1
xe4/2
xe4/3
xe4/4
------------------------------------
#show etherchannel summary
% Aggregator po10 100010
% Aggregator Type: Layer3
% Admin Key: 0010 - Oper Key 0010
% Link: xe4/4 (10072) sync: 1
% Link: xe4/1 (10069) sync: 1
% Link: xe4/2 (10070) sync: 1
% Link: xe4/3 (10071) sync: 1
--------------------------------------
SW2
#configure terminal | Enter configure mode. |
(config)#interface po10 | Creating interface port-channel po10 |
(config-if)#port-channel min-bandwidth 40g | Configuring port channel minimum bandwidth as 40g (range from BANDWIDTH <1-999>k|m for 1 to 999 kilo bits or mega bits <1-1000>g for 1 to 1000 giga bits.) |
(config-if)#exit | Exit the configure mode |
Validation
SW2
#show running-config interface po10
!
interface po10
switchport
bridge-group 1
switchport mode trunk
switchport trunk allowed vlan all
port-channel min-bandwidth 40g
!
#show etherchannel
% Lacp Aggregator: po10
% Min-Bandwidth : 40g
% Member:
xe50/1
xe50/2
xe50/3
xe50/4
#show etherchannel summary
% Aggregator po10 100010
% Aggregator Type: Layer2
% Admin Key: 0010 - Oper Key 0010
% Link: xe50/4 (10072) sync: 1
% Link: xe50/1 (10069) sync: 1
% Link: xe50/2 (10070) sync: 1
% Link: xe50/3 (10071) sync: 1
Note: When a PO goes down due to the [Total bandwidth] < [minimum bandwidth configured ]
SW1:
=====
#sh int brief po10
Codes: ETH - Ethernet, LB - Loopback, AGG - Aggregate, MLAG - MLAG Aggregate
FR - Frame Relay, TUN -Tunnel, PBB - PBB Logical Port, VP - Virtual Port
CVP - Channelised Virtual Port, METH - Management Ethernet, UNK- Unknown
ED - ErrDisabled, PD - Protocol Down, AD - Admin Down,
IA - InActive
PD(Min L/B) - Protocol Down Min-Links/Bandwidth
DV - DDM Violation, NA - Not Applicable
NOM - No operational members, PVID - Port Vlan-id
Ctl - Control Port (Br-Breakout/Bu-Bundle)
HD - ESI Hold Timer Down
--------------------------------------------------------------------------------
Port-channel Type PVID Mode Status Reason Speed
Interface
--------------------------------------------------------------------------------
po10 AGG 1 trunk down PD(Min L/B) 0
#
#sh etherchannel
% Lacp Aggregator: po10
% Min-Bandwidth : 40g
% Protocol Down (Min L/B): True
% Member:
xe4/1
xe4/2
xe4/3
xe4/4
SW2:
=====
#sh etherchannel
% Lacp Aggregator: po10
% Min-Bandwidth : 40g
% Protocol Down (Min L/B): True
% Member:
Xe50/1
Xe50/2
Xe50/3
xe50/4
#sh int brief po10
Codes: ETH - Ethernet, LB - Loopback, AGG - Aggregate, MLAG - MLAG Aggregate
FR - Frame Relay, TUN -Tunnel, PBB - PBB Logical Port, VP - Virtual Port
CVP - Channelised Virtual Port, METH - Management Ethernet, UNK- Unknown
ED - ErrDisabled, PD - Protocol Down, AD - Admin Down,
IA - InActive
PD(Min L/B) - Protocol Down Min-Links/Bandwidth
DV - DDM Violation, NA - Not Applicable
NOM - No operational members, PVID - Port Vlan-id
Ctl - Control Port (Br-Breakout/Bu-Bundle)
HD - ESI Hold Timer Down
--------------------------------------------------------------------------------
Port-channel Type PVID Mode Status Reason Speed
Interface
--------------------------------------------------------------------------------
po10 AGG 1 trunk down PD(Min L/B) 0
#
Last modified date: 07/13/2023