[Bridge] Is there anyway to force an ethernet inteface to stay up (ignore carrier detection) in order to keep the bridge up?

Q theq at rogers.com
Tue Feb 17 03:36:45 UTC 2015


Hi guys

 

I am trying to keep a linux bridge up even when there is no interface
connected to it. Is this possible?

 

 

br0 has eth13 and eth0 ensalved to it

eth0 is up

eht13 is down

 

 

 

 

    /opt# ip link show br0

    25: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP mode DEFAULT group default 

        link/ether 00:0f:20:67:dc:b4 brd ff:ff:ff:ff:ff:ff

    /opt# 

    /opt# 

    /opt/iou/bin# ip link show eth13

    15: eth13: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
master br0 state DOWN mode DEFAULT group default qlen 1000

        link/ether 00:e0:4c:80:1a:50 brd ff:ff:ff:ff:ff:ff

    /opt# 

    /opt# 

    /opt# ip link show eth0

    3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
master br0 state UP mode DEFAULT group default qlen 1000

        link/ether 00:0f:20:67:dc:b4 brd ff:ff:ff:ff:ff:ff

    /opt# 

    /opt# ip link show eth13

    15: eth13: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
master br0 state DOWN mode DEFAULT group default qlen 1000

        link/ether 00:e0:4c:80:1a:50 brd ff:ff:ff:ff:ff:ff

    

    /opt# brctl delif br0 eth0   

    /opt# ip link show br0        

    25: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
state DOWN mode DEFAULT group default 

        link/ether 00:e0:4c:80:1a:50 brd ff:ff:ff:ff:ff:ff

 

thanks

Q

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