[c-nsp] issue on old but running device

[Brian Turnbow]

Hi James

You can use
sh buffers and sh controller g0/2 for more info and then  try and tune
buffers, but this doesn't help a lot usually.
Another thing to check would be for microbursts using the old rate limit
trick setting a policer with exceed action transmit
Then you can check to see if you are overflowing therate limit bucket as
sign of microburst. Like maybe due to speed steps 10G/1G.
Overruns are a sign that the router can't handle the traffic coming in and
may be due to traffic levels or traffic types that take longer to process.
Flow control could help  but I see unsupported listed on the interface and
admit I am not well versed on the 3925 as a platform
Have you tried a reboot ? I have seen routers get out of whack that
magically return to form after a reboot..



Brian Turnbow



Il giorno gio 30 gen 2025 alle ore 14:41 james list via cisco-nsp <
cisco-nsp at puck.nether.net> ha scritto:

> Dear expert
> I'm trying to get any useful insight and I can also understand not polite
> comments...
>
> We've a customer which is experiencing multicast gaps on feed A and we've
> identified an old C3925-SPE200 in a remote location (hence difficult to be
> replaced in a manner) which is experiencing input errors/overrun also on
> low bandwidth and packet rate.
> The customer has the same kind of device in another remote location
> receiving the same multicast feed (feed B) without issues.
> I think these gaps are due to packet dropped ... customer has also tried to
> move interface from g0/1 to g0/2 but no improvement has obtained.
>
> Any idea what could be the reason ?
>
> Thanks in advance
> James
>
> xxx>sh inventory
> NAME: "CISCO3925-CHASSIS", DESCR: "CISCO3925-CHASSIS"
> PID: CISCO3925-CHASSIS , VID: V02, SN: FCZxxx
>
> NAME: "Cisco Services Performance Engine 200 for Cisco 3900 ISR on Slot 0",
> DESCR: "Cisco Services Performance Engine 200 for Cisco 3900 ISR"
> PID: C3900-SPE200/K9   , VID: V04 , SN: FOC160320B7xxx
>
> NAME: "C3900 AC Power Supply 1", DESCR: "C3900 AC Power Supply 1"
> PID: PWR-3900-AC       , VID: V03, SN: SNIxxx
>
> NAME: "C3900 AC Power Supply 2", DESCR: "C3900 AC Power Supply 2"
> PID: PWR-3900-AC       , VID: V03 , SN: QCSxxx
>
>
> xxx>sh int g0/2
> GigabitEthernet0/2 is up, line protocol is up
>   Hardware is iGbE, address is 442b.0316.9302 (bia 442b.0316.9302)
>   Description: To Market
>   MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
>      reliability 255/255, txload 1/255, rxload 2/255
>   Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
>   Keepalive set (10 sec)
>   Full Duplex, 1Gbps, media type is RJ45
>   output flow-control is unsupported, input flow-control is unsupported
>   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 01:18:46
>   Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   30 second input rate 9004000 bits/sec, 2628 packets/sec
>   30 second output rate 9000 bits/sec, 7 packets/sec
>      7936911 packets input, 4224448667 bytes, 0 no buffer
>      Received 7914597 broadcasts (7218973 IP multicasts)
>      0 runts, 0 giants, 0 throttles
>      56932 input errors, 0 CRC, 0 frame, 56932 overrun, 0 ignored
>      0 watchdog, 7914597 multicast, 0 pause input
>      30904 packets output, 2951099 bytes, 0 underruns
>      0 output errors, 0 collisions, 0 interface resets
>      158 unknown protocol drops
>      0 babbles, 0 late collision, 0 deferred
>      0 lost carrier, 0 no carrier, 0 pause output
>      0 output buffer failures, 0 output buffers swapped out
>
>
> interface GigabitEthernet0/2
>  description To Market
>  no ip address
>  load-interval 30
>  duplex full
>  speed 1000
>  hold-queue 2000 in
> !
> interface GigabitEthernet0/2.90
>  description VLAN multicast
>  encapsulation dot1Q 90
>  ip address xx.xx.221.1 255.255.255.0
>  ip pim query-interval 5
>  ip pim bsr-border
>  ip pim dense-mode proxy-register list xx
>  ip multicast boundary xx
>  ip nat outside
>  ip virtual-reassembly in
> !
> interface GigabitEthernet0/2.1683
>  description To market flex vpn
>  encapsulation dot1Q 1683
>  ip address 10.xx.xx.85 255.255.255.252
>  ip access-group CRYPTO-xxx
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