Xen users - Apr 2010 - how do I make sure that bridge is active on Xen

I am doubtful that the default bridge is active.
When I do following no where the bridge name comes how do I make sure
bridge is active.



openworld:/etc/xen# ifconfig

eth2      Link encap:Ethernet  HWaddr 00:26:b9:82:42:38
          inet addr:192.1.100.150  Bcast:172.21.255.255  Mask:255.255.0.0
          inet6 addr: fe80::226:b9ff:fe82:4238/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:136687 errors:0 dropped:0 overruns:0 frame:0
          TX packets:379 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:115126806 (109.7 MiB)  TX bytes:42095 (41.1 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:17 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1281 (1.2 KiB)  TX bytes:1281 (1.2 KiB)

peth2     Link encap:Ethernet  HWaddr 00:26:b9:82:42:38
          inet6 addr: fe80::226:b9ff:fe82:4238/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:178069 errors:0 dropped:0 overruns:0 frame:0
          TX packets:421 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:123134712 (117.4 MiB)  TX bytes:48409 (47.2 KiB)
          Interrupt:32 Memory:da000000-da012100

vif3.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:163192 errors:0 dropped:80 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:1076 (1.0 KiB)  TX bytes:120369832 (114.7 MiB)

vif4.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:130 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:412 (412.0 B)  TX bytes:62179 (60.7 KiB)



In /etc/xen/xend-config.sxp following entries are there

# use
#
 (network-script network-bridge)
#
# Your default ethernet device is used as the outgoing interface, by default.
# To use a different one (e.g. eth1) use
#
# (network-script ''network-bridge netdev=eth1'')
  (network-script ''network-bridge netdev=eth2'''')

# The bridge is named xenbr0, by default.  To rename the bridge, use
#
# (network-script ''network-bridge bridge=<name>'')
#### Tapas made changes
 (network-script ''network-bridge bridge=tapas'')


The defaul ethernet device is eth2 on my system.

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