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Martin Oles
Beginner

SPAN session limitation F1 in N7k

I just came accross quite unexpected behaviour or limitation when SPAN port has been used. I am using N7K-F132XP-15 running 5.2(7). When monitor session is on, then I can observe input discards on port, which does not seems to be related to monitor session. Monitor session is configured to capture traffic for port-channel1, port ethernet1/20 where drops are visible is not part of port-channel, on different ASIC as well. Only what is "common" is VLAN 4 . I would not expect to see input discards on this port. Should there be much more traffic then monitor port ethernet 1/32 is able to handle, then I would expect to see input discards on members of port-channel1. I have been observing input discards arround 15%.

Did I miss some limitation when SPAN is in use on F1 card?

For more clarity please see counters and configuration:

Ethernet1/20 is up
 Dedicated Interface
  Hardware: 1000/10000 Ethernet, address: 523d.e5a0.15ea (bia 523d.e5a0.15ea)
  Description: server
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA
  Port mode is trunk
  full-duplex, 1000 Mb/s, media type is 1G
  Beacon is turned off
  Auto-Negotiation is turned on
  Input flow-control is off, output flow-control is off
  Rate mode is dedicated
  Switchport monitor is off
  EtherType is 0x8100
  Last link flapped 10week(s) 1day(s)
  Last clearing of "show interface" counters never
  1 interface resets
  30 seconds input rate 292183808 bits/sec, 44110 packets/sec
  30 seconds output rate 60671408 bits/sec, 31739 packets/sec
  Load-Interval #2: 5 minute (300 seconds)
    input rate 314.65 Mbps, 46.75 Kpps; output rate 64.27 Mbps, 32.71 Kpps
  RX
    24221691379 unicast packets  0 multicast packets  4380 broadcast packets
    24221695759 input packets  20388831014461 bytes
    0 jumbo packets  0 storm suppression packets
    0 runts  0 giants  0 CRC  0 no buffer
    0 input error  0 short frame  0 overrun   0 underrun  0 ignored
    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop
    0 input with dribble  205710183 input discard
    0 Rx pause
  TX
    17093952127 unicast packets  3840740 multicast packets  14567 broadcast packets
    17097807435 output packets  4320904595501 bytes
    0 jumbo packets
    0 output error  0 collision  0 deferred  0 late collision
    0 lost carrier  0 no carrier  0 babble  0 output discard
    0 Tx pause

Config:

interface port-channel1
  description trunk
  switchport mode trunk
  switchport trunk allowed vlan 1,2,3,4
!
interface Ethernet1/1
  description port channel 1
  switchport mode trunk
  switchport trunk allowed vlan 1,2,3,4
  channel-group 1 mode active
!
interface Ethernet1/2
  description port channel 1
  switchport mode trunk
  switchport trunk allowed vlan 1,2,3,4
  channel-group 1 mode active
!
interface Ethernet1/3
  description port channel 1
  switchport mode trunk
  switchport trunk allowed vlan 1,2,3,4
  channel-group 1 mode active
!
interface Ethernet1/20
  description server
  switchport mode trunk
  switchport trunk allowed vlan 4,5,6,7
!
interface Ethernet1/32
  description network analyzer
  switchport monitor
  speed 1000
!
monitor session 1
  description monitotr session
  source interface port-channel1 both
  destination interface Ethernet1/32
  no shut
end

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