R6.1 Configuration Note Static LAG Last
Updated: 2014-06-13 Version
1.0
Introduction:
With Link Aggregation Group (LAG) technology, the link capacity can be increased without the requirement to upgrade the hardware to support higher speeds. LAG also provides resiliency; if one LAG group fails, the standby LAG group will take over to continue passing traffic.
In 6.1, static LAG provides the ability to configure LAG without enabled LACP.
Setup 1:
Prerequisites:
This Configuration Note assumes that the following base configuration has been implemented on the PEs:
- Cards, MDAs and ports configured
- Interfaces configured
Static LAG configuration
In this example, the 7705 SAR-8 ports 1/1/1 and 1/2/1 are connected to the 7705 SAR-8 ports 1/1/1 and 1/2/1 respectively.
The following are the configuration steps:
- Ports must be in access mode.
- Auto-negotiation has to be disabled to limited.
- LAG selection-criteria configured to best-port.
- LAG standby-signaling configured to power-off.
- Add a port to lag 1 (set priority to enable active or standby).
- For resiliency, add another port in sub-group 2.
- LACP must be disabled.
- Add the lag in a SAP as required.
1. Configure the port (do the same configuration for port 1/2/1 and on the other SAR-8 chassis).
A:SAR8-65>config>port# info detail
----------------------------------------------
description "10/100 Ethernet TX"
ethernet
dot1x
port-control force-auth
no radius-plcy
no re-authentication
re-auth-period 3600
max-auth-req 2
transmit-period 30
quiet-period 60
supplicant-timeout 30
server-timeout 30
exit
mode access
no encap-type
no mtu
no mac
down-when-looped
shutdown
no keep-alive
no retry-timeout
no use-broadcast-address
exit
lldp
dest-mac nearest-bridge
admin-status disabled
no notification
no tx-tlvs
no tx-mgmt-address
exit
dest-mac nearest-non-tpmr
admin-status disabled
no notification
no tx-tlvs
no tx-mgmt-address
exit
dest-mac nearest-customer
admin-status disabled
no notification
no tx-tlvs
no tx-mgmt-address
exit
exit
no hold-time
speed 100
duplex full
autonegotiate limited
ssm
shutdown
code-type sdh
no tx-dus
exit
no egress-rate
no ingress-rate
no dot1q-etype
no qinq-etype
no lacp-tunnel
efm-oam
shutdown
mode active
no accept-remote-loopback
transmit-interval 10 multiplier 5
no hold-time
no tunneling
exit
no loopback
no cfm-loopback
no ptp-asymmetry
exit
no shutdown
----------------------------------------------
2. Configure LAG.
A:SAR8-65# configure lag 10
A:SAR8-65>config>lag# info
----------------------------------------------
port 1/1/1 priority 5 sub-group 2
port 1/2/1 sub-group 1
selection-criteria best-port
standby-signaling power-off
no shutdown
----------------------------------------------
NOTE: For LAG, the ports should be on different MDAs.
Verification:
Use <show lag # detail> to display LAG status, port operation.
A:SAR8-65# show lag 10 detail
===============================================================================
LAG Details
===============================================================================
Description : N/A
-------------------------------------------------------------------------------
Details
-------------------------------------------------------------------------------
Lag-id : 10 Mode : access
Adm : up Opr : up
Thres. Exceeded Cnt : 5 Port Threshold : 0
Thres. Last Cleared : 06/13/2014 13:29:45 Threshold Action : down
Dynamic Cost : false Encap Type : null
Configured Address : 00:21:05:2b:d9:61 Lag-IfIndex : 1342177290
Hardware Address : 00:21:05:2b:d9:61 Adapt Qos : N/A
Hold-time Down : 0.0 sec Port Type : standard
LACP : disabled
Standby Signaling : power-off
Selection Criteria : best-port
Number of sub-groups: 2
-------------------------------------------------------------------------------
Port-id Adm Act/Stdby Opr Primary Sub-group Forced Prio
-------------------------------------------------------------------------------
1/1/1 up active up yes 2 - 5
1/2/1 up standby down 1 - 32768
===============================================================================
Shut down port 1/1/1 and verify that port 1/2/1 becomes active in LAG.
*A:SAR8-65# show lag 10 detail
===============================================================================
LAG Details
===============================================================================
Description : N/A
-------------------------------------------------------------------------------
Details
-------------------------------------------------------------------------------
Lag-id : 10 Mode : access
Adm : up Opr : up
Thres. Exceeded Cnt : 6 Port Threshold : 0
Thres. Last Cleared : 06/17/2014 05:36:10 Threshold Action : down
Dynamic Cost : false Encap Type : null
Configured Address : 00:21:05:2b:d9:61 Lag-IfIndex : 1342177290
Hardware Address : 00:21:05:2b:d9:61 Adapt Qos : N/A
Hold-time Down : 0.0 sec Port Type : standard
LACP : disabled
Standby Signaling : power-off
Selection Criteria : best-port
Number of sub-groups: 2
-------------------------------------------------------------------------------
Port-id Adm Act/Stdby Opr Primary Sub-group Forced Prio
-------------------------------------------------------------------------------
1/1/1 down standby down yes 2 - 5
1/2/1 up active up 1 - 32768
===============================================================================