CCIE Pursuit Blog

May 26, 2009

Core Knowledge Question of the Day: 26 May 2009

R1#show frame pvc interface serial 1/0

PVC Statistics for interface Serial1/0 (Frame Relay DTE)

Active     Inactive      Deleted       Static
Local          1            0            0            0
Switched       0            0            0            0
Unused         0            0            0            0


input pkts 0             output pkts 0            in bytes 0
out bytes 0              dropped pkts 0           in pkts dropped 0
out pkts dropped 0                out bytes dropped 0
in FECN pkts 0           in BECN pkts 0           out FECN pkts 0
out BECN pkts 0          in DE pkts 0             out DE pkts 0
out bcast pkts 0         out bcast bytes 0
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 04:48:15, last time pvc status changed 04:48:14

R1#show traffic-shape serial 1/0

Interface   Se1/0
Access Target    Byte   Sustain   Excess    Interval  Increment Adapt
VC     List   Rate      Limit  bits/int  bits/int  (ms)      (bytes)   Active
–             128000    960    3840      3840      30        480       BECN

Given the output above, which type of traffic-shaping is configured on interface s1/0?

Highlight for answer: Generic Traffic-Shaping (‘traffic-shape’ command under interface s1/0). We can tell this because the VC(virtual circuit) field in the ‘show traffic-shape serial 1/0’ output is null. This is because GTS does not support per-VC traffic-shaping.

If you answered this correctly then you’re either one smart motherfucker, or you’ve worked through the IE Volume I QoS labs.  🙂



  1. haha! i got this right on a lucky ass guess. I wanted to say FRTS, but there wasn’t any packets input or output for the DLCI. Damn, I wish i was that lucky or one smart mofo when I missed the core knowledge section last time. Grr… we shall meet again core knowledge section, and I will break your face. :p

    Comment by luisgarcia — May 26, 2009 @ 10:07 am | Reply

  2. I guessed it right but for the wrong reason. I thought FRTS always incorrectly showed the CIR instead of Bc under ‘sustain bits/int’ so that was supposed to be the difference between the output of the two but after testing it out apparently that only happens if you don’t configure Bc explicitly. Love the questions by the way, keep them coming!

    Comment by Andy — May 26, 2009 @ 10:32 am | Reply

  3. nice question but I think this type of question is unreasonable. you could be the best networker in the world but if u have not spotted this then u would not know. are u sponsered by IE or something???

    but they are nice questions …

    Comment by dinesh2001 — May 27, 2009 @ 6:12 am | Reply

  4. WTF!!! Shit , this way i have no chance 😦

    Comment by mohamed el henawy — May 29, 2009 @ 3:45 pm | Reply

  5. I would say it is “BECN”.

    Comment by jith — June 25, 2009 @ 3:12 am | Reply

RSS feed for comments on this post. TrackBack URI

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

Blog at

%d bloggers like this: