VRF configuration on IOS-XR 4.1.

Hi
I have some questions about VRF configuration on IOS-XR 4.1.
I'm trying to configure BGP routing with vrf and I get the
following error when trying to commit my config:
===================================================
address-family ipv4 unicast
!!% 'BGP' detected the 'warning' condition 'The parent address family
has not been initialized'
===================================================
However, It is solved by configure "address-family vpnv4 unicast"
before committing the vrfs.
But, I'm not sure about that above configure are best practice or not.
Q1. Do you have a best practice configuration of BGP with VRF?
or
Q2. I have to use "address-family vpnv4 unicast" on IOS-XR ?
Please advice me.
Best regards,
Kim

Hi Kim ,
you must configure "address-family vpnv4 unicast" on BGP globally so you will be able to commit the configuration for the address-family.
You can refer the below link to understand how MPLS L3VPN's are configured on IOS-Xr.
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.5/mpls/configuration/guide/gc35v3.html#wp1026378

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    Copyright (c) 1986-2010 by Cisco Systems, Inc.
    Compiled Mon 19-Jul-10 16:23 by prod_rel_team
    ROM: System Bootstrap, Version 12.3(7r)T2, RELEASE SOFTWARE (fc1)
    ERC3-IAD2431-3 uptime is 1 week, 20 hours, 31 minutes
    System returned to ROM by reload at 15:45:52 EDT Mon Oct 27 2014
    System restarted at 15:47:56 EDT Mon Oct 27 2014
    System image file is "flash:c2430-ik9o3s-mz.151-2.T.bin"
    Last reload type: Normal Reload
    This product contains cryptographic features and is subject to United
    States and local country laws governing import, export, transfer and
    use. Delivery of Cisco cryptographic products does not imply
    third-party authority to import, export, distribute or use encryption.
    Importers, exporters, distributors and users are responsible for
    compliance with U.S. and local country laws. By using this product you
    agree to comply with applicable laws and regulations. If you are unable
    to comply with U.S. and local laws, return this product immediately.
    A summary of U.S. laws governing Cisco cryptographic products may be found at:
    http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
    If you require further assistance please contact us by sending email to
    [email protected].
    Cisco IAD2431 (R527x) processor (revision 4.1) with 250880K/11264K bytes of memory.
    Processor board ID FHK1444F1GM
    R527x CPU at 225MHz, Implementation 40, Rev 3.1
    2 FastEthernet interfaces
    48 Serial interfaces
    2 Channelized T1/PRI ports
    1 Virtual Private Network (VPN) Module
    DRAM configuration is 64 bits wide with parity disabled.
    63K bytes of non-volatile configuration memory.
    System fpga version is 250027
    System readonly fpga version is 250027
    Option for system fpga is 'system'.
    126976K bytes of ATA System CompactFlash (Read/Write)
    Configuration register is 0x2102
    ERC3-IAD2431-3#show int fa0/0
    FastEthernet0/0 is up, line protocol is up 
      Hardware is Gt96k FE, address is 5475.d026.3019 (bia 5475.d026.3019)
      Description: Uplink to TWC/Avaya VoIP Network
      Internet address is 24.30.210.144/27
      MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, 
         reliability 255/255, txload 1/255, rxload 1/255
      Encapsulation ARPA, loopback not set
      Keepalive set (10 sec)
      Full-duplex, 100Mb/s, 100BaseTX/FX
      ARP type: ARPA, ARP Timeout 04:00:00
      Last input 00:00:00, output 00:00:00, output hang never
      Last clearing of "show interface" counters never
      Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
      Queueing strategy: fifo
      Output queue: 0/40 (size/max)
      5 minute input rate 2000 bits/sec, 3 packets/sec
      5 minute output rate 1000 bits/sec, 2 packets/sec
         40541 packets input, 6155984 bytes
         Received 20517 broadcasts (0 IP multicasts)
         0 runts, 0 giants, 0 throttles
         0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
         0 watchdog
         0 input packets with dribble condition detected
         149623 packets output, 22178324 bytes, 0 underruns
         0 output errors, 0 collisions, 5 interface resets
         17 unknown protocol drops
         0 babbles, 0 late collision, 0 deferred
         0 lost carrier, 0 no carrier
         0 output buffer failures, 0 output buffers swapped out
    ERC3-IAD2431-3#show int fa0/1
    FastEthernet0/1 is up, line protocol is up 
      Hardware is Gt96k FE, address is 5475.d026.301a (bia 5475.d026.301a)
      Internet address is 172.19.113.242/29
      MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, 
         reliability 255/255, txload 1/255, rxload 1/255
      Encapsulation ARPA, loopback not set
      Keepalive set (10 sec)
      Full-duplex, 100Mb/s, 100BaseTX/FX
      ARP type: ARPA, ARP Timeout 04:00:00
      Last input 00:00:44, output 00:00:05, output hang never
      Last clearing of "show interface" counters never
      Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
      Queueing strategy: fifo
      Output queue: 0/40 (size/max)
      5 minute input rate 0 bits/sec, 0 packets/sec
      5 minute output rate 0 bits/sec, 0 packets/sec
         14829 packets input, 3324508 bytes
         Received 7916 broadcasts (0 IP multicasts)
         0 runts, 0 giants, 0 throttles
         1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
         0 watchdog
         0 input packets with dribble condition detected
         78596 packets output, 7819210 bytes, 0 underruns
         0 output errors, 0 collisions, 13 interface resets
         0 unknown protocol drops
         0 babbles, 0 late collision, 0 deferred
         0 lost carrier, 0 no carrier
         0 output buffer failures, 0 output buffers swapped out
    ERC3-IAD2431-3#
    Thanks,
    Alfy

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