# brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.003005fa7673       no              peth0
                                                        vif1.0
                                                        vif3.0
                                                        vif3.1
xenbr1          8000.003005fa7674       no              peth1

# cat /etc/xen/scripts/dual-ethernet-bridge
#!/bin/sh
# Exit if anything goes wrong.
set -e

# First arg is the operation.
OP=$1
shift

script=/etc/xen/scripts/network-bridge

case ${OP} in
  start)
        $script start vifnum=0 bridge=xenbr0 netdev=eth0
        $script start vifnum=1 bridge=xenbr1 netdev=eth1
        ;;

    stop)
        $script stop vifnum=0 bridge=xenbr0 netdev=eth0
        $script stop vifnum=1 bridge=xenbr1 netdev=eth1
        ;;

    status)
        $script status vifnum=0 bridge=xenbr0 netdev=eth0
        $script status vifnum=1 bridge=xenbr1 netdev=eth1
        $script status vifnum=2 bridge=xenbri netdev=dummy0
        ;;

    *)
       echo 'Unknown command: ' ${OP}
       echo 'Valid commands are: start, stop, status'
       exit 1
esac


# egrep network-script /etc/xen/xend-config.sxp
(network-script dual-ethernet-bridge)



# ethtool peth1
Settings for peth1:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: g
        Current message level: 0x000000ff (255)
        Link detected: yes




# dmesg |grep eth
[    0.746000] eth0: Tigon3 [partno(BCM95715) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:30:05:fa:76:73
[    0.746008] eth0: attached PHY is 5714 (10/100/1000Base-T Ethernet) (WireSpeed[1])
[    0.746013] eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[    0.746017] eth0: dma_rwctrl[76148000] dma_mask[40-bit]
[    0.770477] eth1: Tigon3 [partno(BCM95715) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:30:05:fa:76:74
[    0.770483] eth1: attached PHY is 5714 (10/100/1000Base-T Ethernet) (WireSpeed[1])
[    0.770488] eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] TSOcap[1]
[    0.770493] eth1: dma_rwctrl[76148000] dma_mask[40-bit]
[    5.735055] ADDRCONF(NETDEV_UP): eth0: link is not ready
[    8.453153] tg3: eth0: Link is up at 1000 Mbps, full duplex.
[    8.453159] tg3: eth0: Flow control is off for TX and off for RX.
[    8.454621] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   19.252012] eth0: no IPv6 routers present
[  104.549470] ADDRCONF(NETDEV_UP): peth0: link is not ready
[  107.112101] tg3: peth0: Link is up at 1000 Mbps, full duplex.
[  107.112107] tg3: peth0: Flow control is off for TX and off for RX.
[  107.113527] ADDRCONF(NETDEV_CHANGE): peth0: link becomes ready
[  107.587143] device peth0 entered promiscuous mode
[  107.601094] xenbr0: port 1(peth0) entering forwarding state
[  107.770479] ADDRCONF(NETDEV_UP): peth1: link is not ready
[  107.781487] device peth1 entered promiscuous mode
[  109.323259] tg3: peth1: Link is up at 100 Mbps, full duplex.
[  109.323265] tg3: peth1: Flow control is off for TX and off for RX.
[  109.325031] ADDRCONF(NETDEV_CHANGE): peth1: link becomes ready
[  109.325102] xenbr1: port 1(peth1) entering forwarding state
[  117.476018] peth0: no IPv6 routers present
[  119.928012] peth1: no IPv6 routers present