packet drops on ambiguous sub interface

[nethousebimltd]

Hello,

i want to ask if this is expected behaviour :

TenGigE0/0/0/0 is up, line protocol is up
Interface state transitions: 3
Hardware is TenGigE, address is e0ac.f143.2470 (bia e0ac.f143.2470)
Layer 1 Transport Mode is LAN
Internet address is Unknown
MTU 9014 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)
reliability 255/255, txload 165/255, rxload 18/255
Encapsulation ARPA,
Full-duplex, 10000Mb/s, SR, link type is force-up
output flow control is off, input flow control is off
Carrier delay (up) is 10 msec
loopback not set,
Last link flapped 1w0d
Last input 00:00:00, output 00:00:00
Last clearing of "show interface" counters 6d23h
5 minute input rate 729297000 bits/sec, 346113 packets/sec
5 minute output rate 6502968000 bits/sec, 665744 packets/sec
170247831013 packets input, 46616601319855 bytes, 872 total input drops
688359 drops for unrecognized upper-level protocol
Received 9550069 broadcast packets, 11621565 multicast packets
0 runts, 20347 giants, 0 throttles, 0 parity
20347 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
337022419134 packets output, 415553824360713 bytes, 0 total output drops
Output 0 broadcast packets, 0 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions

RP/0/RSP0/CPU0:# sh interface TenGigE0/0/0/0.100
Wed Mar 2 15:07:24.085 GMT
TenGigE0/0/0/0.100 is up, line protocol is up
Interface state transitions: 3
Hardware is VLAN sub-interface(s), address is e0ac.f143.2470
Internet address is Unknown
MTU 9018 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)
reliability 251/255, txload 158/255, rxload 18/255
Encapsulation 802.1Q Virtual LAN,
Outer Match: Dot1Q VLAN 100
Inner Match: Dot1Q VLAN any
Ethertype Any, MAC Match src any, dest any
loopback not set,
Last link flapped 1w0d
Last input 00:00:01, output 00:00:00
Last clearing of "show interface" counters 6d23h
5 minute input rate 729895000 bits/sec, 346633 packets/sec
5 minute output rate 6228222000 bits/sec, 637804 packets/sec
170249100063 packets input, 46616893052751 bytes, 12233082 total input drops
6584447 drops for unrecognized upper-level protocol
Received 9550181 broadcast packets, 11621599 multicast packets
336912403871 packets output, 415408714044332 bytes, 717187819 total output drops
Output 0 broadcast packets, 0 multicast packets

Configuration :

interface TenGigE0/0/0/0
mtu 9014
!
interface TenGigE0/0/0/0.100
service-policy type control subscriber PPP
pppoe enable bba-group PPPOE
encapsulation ambiguous dot1q 100 second-dot1q any
!

Signal Levels:

PHY data for interface: TenGigE0/0/0/0

SFP EEPROM port: 0
Xcvr Type: SFP
Xcvr Code: SFP-10G-SR
Encoding: 64B66B
Bit Rate: 10300 Mbps
Link Reach 50u fiber: 80 meter
Link Reach 62.5u fiber: 20 meter
Vendor Name: CISCO-AVAGO
Vendor OUI: 00.17.6a
Vendor Part Number: SFBR-709SMZ-CS1 (rev.: G4.1)
Laser wavelength: 850 nm (fraction: 0.00 nm)
Optional SFP Signal: Tx_Disable, Tx_Fault, LOS
Vendor Serial Number: AVD1907AHN5
Date Code (yy/mm/dd): 15/03/02 lot code:
Diagnostic Monitoring: DOM, Int. Cal.,
Enhanced Options: SW RX LOS Mon., SW TX Fault Mon, SW TX Disable, Alarm/Warning Flags

MSA Data
0x0000: 03 04 07 10 00 00 00 00 : 00 00 00 06 67 00 00 00
0x0010: 08 02 00 1e 43 49 53 43 : 4f 2d 41 56 41 47 4f 20
0x0020: 20 20 20 20 00 00 17 6a : 53 46 42 52 2d 37 30 39
0x0030: 53 4d 5a 2d 43 53 31 20 : 47 34 2e 31 03 52 00 17
0x0040: 00 1a 00 00 41 56 44 31 : 39 30 37 41 48 4e 35 20
0x0050: 20 20 20 20 31 35 30 33 : 30 32 20 20 68 f0 03 38
0x0060: 00 00 06 17 38 b0 72 71 : 98 ba 7a f6 aa 65 9a ef
0x0070: 27 04 b1 00 00 00 00 00 : 00 00 00 00 ce ba 67 ab

Thresholds: Alarm High Warning High Warning Low Alarm Low
Temperature: +75.000 C +70.000 C +0.000 C -5.000 C
Voltage: 3.630 Volt 3.465 Volt 3.135 Volt 2.970 Volt
Bias: 10.500 mAmps 10.500 mAmps 2.500 mAmps 2.500 mAmps
Transmit Power: 1.47910 mW (1.69998 dBm) 0.74130 mW (-1.30006 dBm) 0.18620 mW (-7.30020 dBm) 0.07410 mW (-11.30182 dBm)
Receive Power: 1.58490 mW (2.00002 dBm) 0.79430 mW (-1.00015 dBm) 0.10230 mW (-9.90124 dBm) 0.04070 mW (-13.90406 dBm)
Temperature: 19.367
Voltage: 3.258 Volt
Tx Bias: 5.192 mAmps
Tx Power: 0.60520 mW (-2.18101 dBm)
Rx Power: 0.48500 mW (-3.14258 dBm)
Oper. Status/Control:
EEPROM Memory (A2 lower)
0x0100: 4b 00 fb 00 46 00 00 00 : 8d cc 74 04 87 5a 7a 76
0x0110: 14 82 04 e2 14 82 04 e2 : 39 c7 02 e5 1c f5 07 46
0x0120: 3d e9 01 97 1f 07 03 ff : 00 00 00 00 00 00 00 00
0x0130: 00 00 00 00 00 00 00 00 : 00 00 00 00 00 00 00 00
0x0140: 00 00 00 00 3f 80 00 00 : 00 00 00 00 01 00 00 00
0x0150: 01 00 00 00 01 00 00 00 : 01 00 00 00 00 00 00 14
0x0160: 13 5e 7f 41 0a 24 17 a4 : 12 f2 00 00 00 00 00 00
0x0170: 00 00 00 00 00 00 00 00 : 00 00 1d 00 00 00 00 00

CLEI Code: COUIA8NCAA
Part Number: 10-2415-03 (ver.: V03 )
Temp/Alarm/Power Flags: COM, commercial 0C to 70C
Minimum Temperature: 0
Maximum Temperature: 70
Calibration Constants:
Product Id: SFP-10G-SR
EEPROM Memory (A2 upper)
0x0180: 43 4f 55 49 41 38 4e 43 : 41 41 31 30 2d 32 34 31
0x0190: 35 2d 30 33 56 30 33 20 : 01 00 46 00 00 00 00 c6
0x01a0: 00 00 00 00 00 00 00 00 : 00 00 00 00 00 00 00 00
0x01b0: 00 00 00 00 00 00 00 00 : 00 00 00 00 00 00 aa aa
0x01c0: 53 46 50 2d 31 30 47 2d : 53 52 20 20 20 20 20 20
0x01d0: 20 20 20 20 33 32 00 00 : 00 00 00 00 00 00 00 35
0x01e0: 1e 28 2e 2e 31 34 29 36 : 00 00 00 00 00 00 00 00
0x01f0: 00 00 00 00 00 66 00 00 : ff ff ff ff 00 00 00 00

[Kasun Bandara]

• reliability 255/255: When the input and output errors increase, they affect the reliability counter. This indicates how likely it is that a packet can be delivered or received succesfully. Reliability is calculated like this: reliability = number of packets / number of total frames. The value of 255 is the highest value meaning that the interface is very reliable at the moment.  The calculation above is done every 5 minutes.

https://networklessons.com/cisco/ccnp-tshoot/cisco-ios-show-interface-explained#:~:text=Reliability%20is%20calculated%20like%20this,is%20done%20every%205%20minutes.

[balaji.bandi]

we have suggested before, what was the outcome of this thread :

https://community.cisco.com/t5/xr-os-and-platforms/ambiguous-vlan-reliability-problem/m-p/4558190#M12955

[nethousebimltd]

Hello Balaji,

i already cleared counters drops increases and reliability is not 255/255 , if you check carefully physical interface dont have any issues, only vlan interface has...

[balaji.bandi]

You have many drops

170249100063 packets input, 46616893052751 bytes, 12233082 total input drops
6584447 drops for unrecognized upper-level protocol
Received 9550181 broadcast packets, 11621599 multicast packets
336912403871 packets output, 415408714044332 bytes, 717187819 total output drops

Check how is your network connected ? how is your other side VLAN 100 configured ?

[nethousebimltd]

REMOTE ASR9K INTERFACE STATUS AND CONFIG

TenGigE0/5/0/24 is up, line protocol is up
Interface state transitions: 29
Hardware is TenGigE, address is 5087.8961.9c28 (bia 5087.8961.9c28)
Layer 1 Transport Mode is LAN
Description: SSG
Internet address is Unknown
MTU 9014 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)
reliability 255/255, txload 18/255, rxload 171/255
Encapsulation ARPA,
Full-duplex, 10000Mb/s, SR, link type is force-up
output flow control is off, input flow control is off
Carrier delay (up) is 10 msec
loopback not set,
Last link flapped 1w0d
Last input 00:00:00, output 00:00:00
Last clearing of "show interface" counters 00:01:03
5 minute input rate 6706307000 bits/sec, 683736 packets/sec
5 minute output rate 725944000 bits/sec, 351460 packets/sec
43469779 packets input, 53122582891 bytes, 0 total input drops
0 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 0 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
22352490 packets output, 5674764388 bytes, 0 total output drops
Output 1243 broadcast packets, 1893 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions

RP/0/RSP0/CPU0:#sh interface TenGigE0/5/0/24.50
Wed Mar 2 17:07:34.621 GMT
TenGigE0/5/0/24.50 is up, line protocol is up
Interface state transitions: 29
Hardware is VLAN sub-interface(s), address is 5087.8961.9c28
Layer 2 Transport Mode
MTU 9022 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)
reliability Unknown, txload Unknown, rxload Unknown
Encapsulation 802.1Q Virtual LAN,
Outer Match: Dot1Q VLAN 100
Inner Match: Dot1Q VLAN 50
Ethertype Any, MAC Match src any, dest any
loopback not set,
Last link flapped 1w0d
Last input 00:00:08, output 00:00:00
Last clearing of "show interface" counters 00:01:09
15005 packets input, 11207173 bytes
0 input drops, 0 queue drops, 0 input errors
14934 packets output, 4627804 bytes
0 output drops, 0 queue drops, 0 output errors

interface TenGigE0/5/0/24
mtu 9014
!
interface TenGigE0/5/0/24.50 l2transport
encapsulation dot1q 100 second-dot1q 50
rewrite ingress tag pop 2 symmetric

l2vpn
xconnect group TELEKOM_SW_P2P_C_PPP
p2p C_TEST_PPP
interface TenGigE0/5/0/24.50
neighbor ipv4 172.31.8.136 pw-id 50

[TelluR]

Hey  nethousebimltd,

I think you have an MTU mismatch because you use ambiguous an unambiguous mode between the two Routers.

TenGigE0/0/0/0 is up, line protocol is up
MTU 9014 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)

RP/0/RSP0/CPU0:# sh interface TenGigE0/0/0/0.100
MTU 9018 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)

interface TenGigE0/0/0/0.100
encapsulation ambiguous dot1q 100 second-dot1q any

TenGigE0/5/0/24 is up, line protocol is up
MTU 9014 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)

RP/0/RSP0/CPU0:#sh interface TenGigE0/5/0/24.50
MTU 9022 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)

interface TenGigE0/5/0/24.50 l2transport
encapsulation dot1q 100 second-dot1q 50

Too much VLAN Tags

Source: https://www.cisco.com/en/US/docs/ios/lanswitch/configuration/guide/lsw_ieee_802.1q.html#wp1068909

king regards

TelluR