Re: using a bridge (setting priority eth0 > ath0)

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Joachim Schiele wrote:
> hello,
> 
> what i want to do:
> having two computers both equipped with:
> lspci
> 01:09.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit 
> Ethernet (rev 10)
> 01:0a.0 Ethernet controller: Atheros Communications Inc. AR5212/AR5213 
> Multiprotocol MAC/baseband processor (rev 01)

For this kind of setup, if might be easier to setup a bonding interface, instead of a bridge interface.

With a bonding setup, you can define a primary adapter that will be used when available.

	Nicolas.

> 
> i create two bridges (one on each host)
> pc2b ~ # brctl show br0
> bridge name     bridge id               STP enabled     interfaces
> br0             0000.0040f4a0b037       yes             ath0
>                                                         eth0
> 
> and then i set all interfaces up using:
> ip l set ath0 up
> ip l set eth0 up
> ip l set br0 up
> 
> i put one ath0 interface into master mode and the other ath0 is a normal 
> station (client). the connections eth0-eth0 works great, also the ath0-ath0 
> link works great (tested with and without bridge).
> 
> in general everything works, if i either one of the 4 interfaces down 
> (eth0/eth0/ath0/ath0) stp's work creates a working path in no time.
> 
> the issue is - the reason i write to this list however:
> when all interfaces are up the data always is going over ath0-ath0 instead of 
> eth0-eth0. (the wireless lan should be my backup link).
> 
> i issues setbridgeprio br0 1 and setbridgeprio br0 10. as well as setpathcost 
> with various consistent experiments. say one experiment i set all ath0 
> pathcosts to a value 100 all eth0 to 999. 
> i don't see any difference when doing the opposite.
> 
> any idea? 
> 
> dmesg added but i don't see anything special there. there was an error once 
> but i think that might have something todo with the routing loop i caused 
> (which i resolved with adding setfd with a higher value).
> 
> thanks,
> joachim schiele
> 
> 
> 
> 
> 
> ============ pc2 ==============
> dmesg
> br0: port 2(ath0) entering forwarding state
> br0: topology change detected, propagating
> br0: port 1(eth0) entering forwarding state
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> br0: no IPv6 routers present
> br0: received tcn bpdu on port 1(eth0)
> br0: topology change detected, propagating
> br0: port 2(ath0) entering disabled state
> br0: port 2(ath0) entering listening state
> br0: port 2(ath0) entering learning state
> br0: topology change detected, propagating
> br0: port 2(ath0) entering forwarding state
> ath0: no IPv6 routers present
> br0: received tcn bpdu on port 1(eth0)
> br0: topology change detected, propagating
> br0: port 2(ath0) entering disabled state
> br0: port 2(ath0) entering listening state
> br0: port 2(ath0) entering learning state
> br0: topology change detected, propagating
> br0: port 2(ath0) entering forwarding state
> ath0: no IPv6 routers present
> br0: received tcn bpdu on port 1(eth0)
> br0: topology change detected, propagating
> 
> ip l
> 14: ath0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue 
> state UNKNOWN
>     link/ether 00:40:f4:a0:b0:37 brd ff:ff:ff:ff:ff:ff
> 3: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
> state UP qlen 1000
>     link/ether 00:40:f4:eb:16:45 brd ff:ff:ff:ff:ff:ff
> 
> pc2b ~ # brctl show
> bridge name     bridge id               STP enabled     interfaces
> br0             0000.0040f4a0b037       yes             ath0
>                                                         eth0
> pc2b ~ # brctl showstp br0
> br0
>  bridge id              0000.0040f4a0b037
>  designated root        0000.0040f4a0b037
>  root port                 0                    path cost                  0
>  max age                   9.99                 bridge max age             
> 9.99
>  hello time                1.99                 bridge hello time          
> 1.99
>  forward delay             2.99                 bridge forward delay       
> 2.99
>  ageing time               3.99
>  hello timer               1.49                 tcn timer                  
> 0.00
>  topology change timer     0.00                 gc timer                   
> 1.49
>  flags
> 
> 
> ath0 (2)
>  port id                0402                    state                
> forwarding
>  designated root        0000.0040f4a0b037       path cost                999
>  designated bridge      0000.0040f4a0b037       message age timer          
> 0.00
>  designated port        0402                    forward delay timer        
> 0.00
>  designated cost           0                    hold timer                 
> 0.48
>  flags
> 
> eth0 (1)
>  port id                2801                    state                
> forwarding
>  designated root        0000.0040f4a0b037       path cost                111
>  designated bridge      0000.0040f4a0b037       message age timer          
> 0.00
>  designated port        2801                    forward delay timer        
> 0.00
>  designated cost           0                    hold timer                 
> 0.48
>  flags
> 
> arp -e
> 10.0.0.1                 ether   00:40:f4:a0:b0:00   C                     br0
> 
> 
> 
> 
> 
> 
> 
> 
> 
> ============ pc6 ==============
> ip l
> 17: ath0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc noqueue 
> state UP
>     link/ether 00:40:f4:a0:b0:00 brd ff:ff:ff:ff:ff:ff
> 3: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
> state UP qlen 1000
>     link/ether 00:40:f4:ec:59:06 brd ff:ff:ff:ff:ff:ff
> 
> dmesg
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> __ratelimit: 9560 callbacks suppressed
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> eth0: received packet with  own address as source address
> br0: port 2(ath0) entering disabled state
> __ratelimit: 7851 callbacks suppressed
> eth0: received packet with  own address as source address
> br0: port 2(ath0) entering listening state
> br0: port 2(ath0) entering learning state
> br0: topology change detected, sending tcn bpdu
> br0: port 2(ath0) entering forwarding state
> br0: port 2(ath0) entering disabled state
> eth0: received packet with  own address as source address
> br0: port 2(ath0) entering listening state
> br0: port 2(ath0) entering learning state
> br0: topology change detected, sending tcn bpdu
> br0: port 2(ath0) entering forwarding state
> br0: port 2(ath0) entering disabled state
> eth0: received packet with  own address as source address
> br0: port 2(ath0) entering listening state
> br0: port 2(ath0) entering learning state
> br0: topology change detected, sending tcn bpdu
> br0: port 2(ath0) entering forwarding state
> 
> arp -e
> PC2                      ether   00:40:f4:a0:b0:37   C                     br0
> 
> pc2b ~ # brctl  show
> bridge name     bridge id               STP enabled     interfaces
> br0             0000.0040f4a0b037       yes             ath0
>                                                         eth0
> pc2b ~ # brctl showstp br0
> br0
>  bridge id              0000.0040f4a0b037
>  designated root        0000.0040f4a0b037
>  root port                 0                    path cost                  0
>  max age                   9.99                 bridge max age             
> 9.99
>  hello time                1.99                 bridge hello time          
> 1.99
>  forward delay             2.99                 bridge forward delay       
> 2.99
>  ageing time               3.99
>  hello timer               1.20                 tcn timer                  
> 0.00
>  topology change timer     0.00                 gc timer                   
> 0.20
>  flags
> 
> 
> ath0 (2)
>  port id                0402                    state                
> forwarding
>  designated root        0000.0040f4a0b037       path cost                999
>  designated bridge      0000.0040f4a0b037       message age timer          
> 0.00
>  designated port        0402                    forward delay timer        
> 0.00
>  designated cost           0                    hold timer                 
> 0.20
>  flags
> 
> eth0 (1)
>  port id                2801                    state                
> forwarding
>  designated root        0000.0040f4a0b037       path cost                111
>  designated bridge      0000.0040f4a0b037       message age timer          
> 0.00
>  designated port        2801                    forward delay timer        
> 0.00
>  designated cost           0                    hold timer                 
> 0.20
>  flags
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> https://lists.linux-foundation.org/mailman/listinfo/bridge
> 

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