[f-nsp] packetloss B2P622 POS blades
Jeroen Oldenhof
jeroen at cj2.nl
Tue Feb 10 10:12:45 EST 2009
Ronald Esveld schreef:
> Jeroen,
>
> Try hw bc, to see if anything is wrong with the hw buffers
>
Hi Ronald,
Thanks for your suggestion. I pasted the output of 'hw bc' and also 'sh
back' for reference below.
I notice that the WriteDrops counters are rising pretty fast (1-10
p/second) on the B24E at rtr-A and the B2P622 on rtr-B..
could this indicate a problem on these boards?
Best,
- Jeroen
rtr-A#hw bc
Slot FreeDepth WriteDrop WriteIn WriteOut ReadIn ReadOut
UseIn UseOut FreeIn FreeOut
1 3983 2942481 10814209 16571486 16571486 16571486
14751231 6051473 8993954 7662627
2 900 8880735 11046211 5143640 5143640 5143640
5143640 2165476 11046211 11046334
4 910 3527799 4921759 11235329 11235329 11235329
11235329 1393960 4921759 4921872
rtr-A#hw back
Slot Mod FreeQ DMADrop BPDrop WriteDrop Last
-----------------------------------------------------------------------
1 B4GMR4 3983 0 0 2942481 D:26 H:23M:24S:8
2 B24E 900 0 0 8881143 D:26 H:23M:24S:8
4 B2P622 910 0 0 3527799 D:26 H:23M:24S:8
rtr-B#hw bc
Slot FreeDepth WriteDrop WriteIn WriteOut ReadIn ReadOut
UseIn UseOut FreeIn FreeOut
1 1939 7 10548638 14716992 14716992 14716992
10526350 6357989 6357996 4878671
2 916 0 8861748 8861771 8861771 8861771
8861772 8861749 8861749 8861856
3 900 0 815540 815672 815672 815672
815672 815540 815540 815663
4 910 315291 15082124 16210906 16210906 16210906
16210906 14766833 15082124 15082237
rtr-B#sh back
Slot Mod FreeQ DMADrop BPDrop WriteDrop Last
-----------------------------------------------------------------------
1 B8GMR 1939 0 0 7 D:1 H:15M:37S:5
2 B8GC 916 0 0 0 NEVER
3 B24E 900 0 0 0 NEVER
4 B2P622 909 0 0 315580 D:1 H:15M:34S:5
> -----Oorspronkelijk bericht-----
> Van: foundry-nsp-bounces at puck.nether.net
> [mailto:foundry-nsp-bounces at puck.nether.net] Namens Jeroen Oldenhof
> Verzonden: dinsdag 10 februari 2009 14:29
> Aan: foundry-nsp at puck.nether.net
> Onderwerp: [f-nsp] packetloss B2P622 POS blades
>
> Hi!
>
> Has anyone experience with the B2P622 Foundry POS blades?
>
> We've deployed them around 9 months ago when we took our STM-1 in
> production.. but since then we're constantly facing packetloss of about
> 1%.
>
> Our setup (hope it remains readable):
> +-------+ STM-1 +-------+
> Transits / <---+--+ RTR-A +=============+ RTR-B +--- <internal>
> IX's | +-------+ +-------+
> +-----+-+
> |monitor|
> +-------+
>
> RTR-A&B: Foundry BI4000 w/MGMT4 ironcore running 07.8.04 (B2R07804).
> RTR-A is an edge-router facing several transits and exchanges. Through
> the STM it is connected to RTR-B using iBGP.
> the monitor is used for smokeping and other management tasks.
>
> At first we performed eBGP routing to the ix's and transits on RTR-A.
> This caused much packetloss, even when pinging from the monitor-box to
> RTR-A directly. With no traffic packetloss is zero, but getting much
> worse when the amount of traffic grows, around 4% at 60mbit. RTR-A was
> also pulling around 20% CPU. I assume the POS interface has little or no
>
> CAM for layer 3, which makes it querying the CPU big time. This being a
> resource consuming i guess some packets could be dropped there.
>
> We then moved all routing and BGP functionality to RTR-B, making RTR-A
> simply a breakout box. Packetloss is reduced, but still around 1%.. and
> the smokepings sill looks awful..
> We also swapped POS/FE/MGMT blades and ports and tried different
> firmwares on both ends. No port-errors on both ethernet ports or POS
> ports. The STM provider (TATA) reports no errors.
>
> On all paths outside the STM there is ZERO loss: from monitoring box to
> several internet destinations, from and to several internal hosts past
> the RTR.. so the STM and its interfaces are definately the problem.
>
> I figured out that some POS debugging can be done using 'dm console-on 4
>
> 2', 'dm cli 4 2 Q' returns some interesting commands.. but I can't find
> a way to use them properly..
>
> so.. anyone on this list has any experience with these? Or encountered
> simmillar issues?
>
> Thanks!
>
> Jeroen Oldenhof
>
> telnet at RTR-B# show pos 4/2
>
> POS4/2 is up, line protocol is up
> No port name
> Hardware is Packet over Sonet
> Peer Internet address is 0.0.0.0
> MTU 4470 bytes, encapsulation PPP, clock is line
> Framing is SDH, BW 155000Kbit, CRC 32
> Loopback not set, keepalive is set (10 sec), scramble disabled
> LCP state is opened, IPCP state is init
> 300 second input rate: 50423416 bits/sec, 8213 packets/sec
> 300 second output rate: 12068536 bits/sec, 5802 packets/sec
> 2135136909 packets input, 11504550338524 bytes, 0 no buffer
> Received 0 CRCs, 0 shorts, 0 giants, 0 alignments
> 1940413782 packets output, 2732631789028 bytes, 0 underruns
> Line protocol is UP
> Member of 5 L2 VLANs, port is tagged, port state is FORWARDING
> STP configured to ON
> Configured Path Trace String :
> Received Path Trace String : RTR-A 4/2
>
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