[cisco-bba] strange PPPoE virtual-access interface

[Mark Johnson]

At 06:05 PM 11/20/2003 +0200, Tassos Chatzithomaoglou wrote:
>I have noticed that after booting a 7200 a "strange" virtual-access 
>interface is created, although no actual users exist in the router.
>This va interface is said to be a PPPoE interface, but i don't have any 
>pppoe config on the router, just L2TP termination.

 From CSCdz83041:

"The Virtual-Access1 interface is a Base VtMgr vaccess (also seen in
the output of "show interface virtual-access 1"). This is created for
internal use and is not freed.

When PPPoE or PPPoA are enabled, a base vaccess is created for
each application. Similarly, when a VPDN tunnel is terminated
on the LNS, a base vaccess is created for it. These base vaccess are
needed to support sub-interfaces, utilizing the various vectors
in the base vaccess's hwidb. These base vaccesses are not freed,
and this is the expected behavior."

Then there is also CSCdy60608 (not viewable), which I think eliminates
this VA creation for any image that has the PPPoE subsystem (regardless
of PPPoE being configured).

Fixed in 12.3.  Looks harmless, still.

mark




>Nov 20 17:42:01: %SYS-5-RESTART: System restarted --
>Cisco Internetwork Operating System Software
>IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(15)T9,  RELEASE SOFTWARE 
>(fc2)
>TAC Support: http://www.cisco.com/tac
>Copyright (c) 1986-2003 by cisco Systems, Inc.
>Compiled Sat 01-Nov-03 01:10 by ccai
>Nov 20 17:42:01: %SNMP-5-COLDSTART: SNMP agent on host router is 
>undergoing a cold start
>Nov 20 17:42:01: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state 
>to up
>Nov 20 17:42:01: %SYS-6-BOOTTIME: Time taken to reboot after reload = 
>1069342922 seconds
>Nov 20 17:42:02: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
>Virtual-Access1, changed state to up
>
>
>router#sh int virtual-access 1
>Virtual-Access1 is up, line protocol is up
>   Hardware is Virtual Access interface
>   MTU 1492 bytes, BW 100000 Kbit, DLY 100000 usec,
>      reliability 255/255, txload 1/255, rxload 1/255
>   Base PPPoE vaccess, loopback not set
>   DTR is pulsed for 5 seconds on reset
>   Last input never, output never, output hang never
>   Last clearing of "show interface" counters 00:17:56
>   Input queue: 0/4096/0/0 (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
>      0 packets input, 0 bytes, 0 no buffer
>      Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
>      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
>      0 packets output, 0 bytes, 0 underruns
>      0 output errors, 0 collisions, 0 interface resets
>      0 output buffer failures, 0 output buffers swapped out
>      0 carrier transitions
>
>
>router#sh int virtual-access 1 configuration
>Virtual-Access1 is a PPP over Ethernet link (sub)interface
>
>Derived configuration : 61 bytes
>!
>interface Virtual-Access1
>  no ip address
>  ip mtu 1500
>end
>
>router#sh vtemplate
>Virtual access subinterface creation is globally disabled
>
>          Active     Active    Subint  Pre-clone Pre-clone
>        Interface Subinterface Capable Available   Limit
>        --------- ------------ ------- --------- ---------
>Vt1            0            0    No          --        --
>Vt2            0            0    No          --        --
>
>Usage Summary
>                       Interface   Subinterface
>                       ---------   ------------
>Current in use                1              0
>Current free                  0              0
>Total                         1              0
>
>
>router#sh pppoe session all
>Total PPPoE sessions 0
>
>PPPoE Session Information
>
>--
>***********************************
>    Chatzithomaoglou Anastasios
>Network Design & Operations Center
>           FORTHnet S.A.
>       <achatz at forthnet.gr>
>***********************************
>
>
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