[c-nsp] 6500 SUP720 High Latency and Jitter issues

[Anthony D Cennami]

Are you seeing any BGP or OSPF route withdrawls during this period?

Have you validated your spanning tree configuration is loop free?  Are you
using RSTP?

Are you using any non-standard timers on BGP or OSPF?

Could you paste a sh proc cpu during the latency increse?




> Hello all, I am in dire need of some assistance with a new problem that
> has started occurring in one of my networks.  We are seeing very high
> Latency and Jitter traversing one of our 6509's that has a sup720 with
> the PFC3BXL and a GIG or Ram.  This period occur every 10 to 15 seconds,
> and last for about 2 seconds.  This is causing a massive amount of
> troubles for our customers and I am at a loss as to what could be the
> cause.
>
> Hardware:
>
>  Cisco 6509, Fan2, Sup720,PFC3BXL, 1GIGe of Ram, 1x8 port GBIC gige,
> 1x48 port FE.
>
> Config:
>
>  IOS Version 12.2(18)SXD3, running 2 full BGP routing tables to ISP's
> VIA FE and GIGe.  OSPF running for core network with 5 neighbors.  2
> VLans with ports assigned to them.  6 GRE tunnels for private access to
> other offsite POPs.  NAT running with overload to a public VLAN
> interface.  Router CPU average load is 50% per 24 hours, peaks around
> 60%, lows around 20%.  Mem usage is at 20%.
>
> Issue:
>
> Every 5 to 15 seconds we are seeing pings like this traversing the box:
>
> 64 bytes from 147.135.0.16: icmp_seq=2099 ttl=63 time=1.000 ms
> 64 bytes from 147.135.0.16: icmp_seq=2100 ttl=63 time=1.000 ms
> 64 bytes from 147.135.0.16: icmp_seq=2101 ttl=63 time=1.033 ms
> 64 bytes from 147.135.0.16: icmp_seq=2102 ttl=63 time=1.037 ms
> 64 bytes from 147.135.0.16: icmp_seq=2103 ttl=63 time=1.001 ms
> 64 bytes from 147.135.0.16: icmp_seq=2104 ttl=63 time=86.345 ms
> 64 bytes from 147.135.0.16: icmp_seq=2105 ttl=63 time=179.171 ms
> 64 bytes from 147.135.0.16: icmp_seq=2106 ttl=63 time=178.301 ms
> 64 bytes from 147.135.0.16: icmp_seq=2107 ttl=63 time=108.800 ms
> 64 bytes from 147.135.0.16: icmp_seq=2108 ttl=63 time=33.387 ms
> 64 bytes from 147.135.0.16: icmp_seq=2109 ttl=63 time=1.018 ms
> 64 bytes from 147.135.0.16: icmp_seq=2110 ttl=63 time=1.014 ms
> 64 bytes from 147.135.0.16: icmp_seq=2111 ttl=63 time=1.064 ms
> 64 bytes from 147.135.0.16: icmp_seq=2112 ttl=63 time=1.023 ms
> 64 bytes from 147.135.0.16: icmp_seq=2113 ttl=63 time=1.042 ms
>
> I am used to the 60 sec. ICMP de-pri BGP update CPU load pinging the box
> directly, but I have never seen this effect devices on the far side of
> the router.  Any input on this is greatly appreciated.  //db
>
>
>
>
>
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