[c-nsp] Cisco 6500 packet loss

Wed Feb 26 09:35:13 EST 2014

Hi Phil

version s72033-adventerprisek9_wan-mz.122-18.SXF17b.bin"

 Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  1    8  8 port 1000mb GBIC Enhanced QoS        WS-X6408A-GBIC     SAL08342NRB
  2    3  MWAM Module                            WS-SVC-MWAM-1      SAD081203GK
  3   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     SAL09337TUQ
  4   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     SAL1248BJHJ
  5    3  MWAM Module                            WS-SVC-MWAM-1      SAD115203XZ
  6    2  Supervisor Engine 720 (Active)         WS-SUP720-3B       SAL0949781R

Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  1  0011.bbb5.4368 to 0011.bbb5.436f   3.1   5.4(2)       8.5(0.46)RFW Ok
  2  0003.feae.bb8c to 0003.feae.bb93   3.0   7.2(1)       2.1(3.0)     Ok
  3  0014.f2f9.cfdc to 0014.f2f9.d00b   2.3   12.2(14r)S5  12.2(18)SXF1 Ok
  4  0021.a0ca.d7e8 to 0021.a0ca.d817   3.0   12.2(18r)S1  12.2(18)SXF1 Ok
  5  001d.a222.e69e to 001d.a222.e6a5   6.3   7.2(1)       2.1(3.0)     Ok
  6  0014.a97e.332c to 0014.a97e.332f   4.4   8.5(2)       12.2(18)SXF1 Ok

Mod  Sub-Module                  Model              Serial       Hw     Status
---- --------------------------- ------------------ ----------- ------- -------
  3  Centralized Forwarding Card WS-F6700-CFC       SAL1204E1LT  4.0    Ok
  4  Centralized Forwarding Card WS-F6700-CFC       SAL1250D1NZ  4.1    Ok
  6  Policy Feature Card 3       WS-F6K-PFC3B       SAL09497AUY  2.1    Ok
  6  MSFC3 Daughterboard         WS-SUP720          SAL09486Q2Z  2.3    Ok

Mod  Online Diag Status
---- -------------------
  1  Pass
  2  Pass
  3  Pass
  4  Pass
  5  Pass
  6  Pass

config

the vlan where we dont have packet loss

interface Vlan572
 ip address x.x.72.3 255.255.255.128
 ip flow ingress
 vrrp 8 ip x.x.72.1
 vrrp 8 priority 120

the vlan where we have packet loss

interface Vlan573
 ip address x.x.73.3 255.255.255.128
 ip flow ingress
 vrrp 9 ip x.x.73.1
 vrrp 9 priority 120

interface Vlan574
 ip address x.x.74.3 255.255.255.128
 ip flow ingress
 vrrp 10 ip x.x.74.1
 vrrp 10 priority 120

have verified the external interface counter but found no CRC or errors

our peegin interface
 5 minute input rate 118039000 bits/sec, 60486 packets/sec
  5 minute output rate 96750000 bits/sec, 62436 packets/sec
  L2 Switched: ucast: 272129731 pkt, 38573157029 bytes - mcast: 8044221 pkt, 514830144 bytes
  L3 in Switched: ucast: 2792738712980 pkt, 498797687455639 bytes - mcast: 0 pkt, 0 bytes mcast
  L3 out Switched: ucast: 2727571573714 pkt, 479076546268954 bytes mcast: 0 pkt, 0 bytes
     2795910577564 packets input, 499266285661590 bytes, 0 no buffer
     Received 17021017 broadcasts (1 IP multicasts)
     13 runts, 0 giants, 3 throttles
     13 input errors, 13 CRC, 13 frame, 141130 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     2727735844634 packets output, 479092825733853 bytes, 0 underruns

Nareshchandra Paturi

On , naresh reddy <nareshbtech at yahoo.com> wrote:

Hi  
I have attached a description diagram

http://postimg.org/image/cbm1xp3c7/

svis are on the 6500 destination is 11 hops away and route is learned from BGP table

the first hop is an isp

i hope this is bit clear

On Wednesday, February 26, 2014 2:15 PM, naresh reddy <nareshbtech at yahoo.com> wrote:

Hi phil/Velimir

its our edge router a 6500 with sup 3b
its has SVIs  and the isp terminates on the same device

when reaching a desitination we are loosing packets when sources form some vlans but not in other

int vlan 1  ------->
bgp peer int---------------------->DESintation
int vlan 2  ------->

|<-------same 6500--->

Nareshchandra Paturi

On Wednesday, February 26, 2014 1:35 PM, Phil Mayers <p.mayers at imperial.ac.uk> wrote:

On 26/02/14 13:02, naresh reddy wrote:
> Hi All
>
> i am seeing a wierd issue on a 6500
>
> wee are seeing packet loss to a remote location when sourced form some SVIs
>
> but not when sourced from some other SVis

That's a bit vague. You'll need to be more specific about topology and 
config for people to help you. Please specify software and module 
version/types, sample config of SVIs and ports they're on.

As someone else points out, it could be a faulty link. Have you checked 
the "sh int" counters?

Alternatively it could be TCAM mis-program, and CPU punt; you can use 
SPAN/ERSPAN to check this.

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