NCS5500: Life of a Packet(Transit, Punt/Inject, Ping Path)

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Updated:August 1, 2021

Document ID:217276

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

Introduction

This document describes the path taken by ICMP echo request/Echo Reply packets inside NCS55xx(Fretta) box.

Life of a Packet in Forwarding ASIC

IRPP

A packet is received on an interface and passed to IRPP where the first 128 bytes will be extracted and processed. As a result, the internal system header is prepended.

ITM

The packet gets stored in DRAM/OCB

ITPP

If needed rewrite the system header(multicast replication, Port mirroring, etc)

Packets are split into cells and loadbalanced to Fabric

ERPP

Cells are received and reassembled. The first 128 bytes are extracted and apply all link-layer filters, Egress ACL, Egress Replication(Multicast)

ETPP/ETM

The Entire packet is stored in a buffer until the packet out is scheduled. System headers are removed.

Pipeline Forwarding ASIC

IRPP (Port Term, Parser)

Port Termination: Packets received from Network interface/CPU/Recirculation

Determine source port and mark packet with it.
Decide the initial program to use in Parser.
Identify where the network header starts.

Parser: Extract Ethertype, MAC Addresses, Determine offset for next stages in the pipeline.

IRPP(Line Layer, VLAN Trans)

Link Layer: Filtering on L2 and source address authentication.

VLAN Translation: We map the logical interface of the packet.

Punt Path

Only a few LPTS TCAM entries are available on the NPU due to a lack of TCAM resources.
Major LPTS lookup is done in SW LPTS Pre-IFIB on LC Netio
LPTS punt packet from NPU to RP directly via PMF TCAM lookup:
- OSPF, OSPFv3 mcast, ISIS packets are punted to active and Standby RP directly
LPTS punt packet from NPU to local CPU via PMF TCAM lookup:
- Any protocol that uses TCP, UDP; ICMP, ND
L2 protocol packets are punted to LC via BRCM CPU trap:
- ARP, RARP, CDP, LACP, LLDP, Ether-link OAM, MACSec
Exception packets are punted to LC via BRCM CPU trap.
- TTL0, TTL1, MTU Exceed, Option packets

Punt Path between two CPU nodes

Punt Path from NPU to RP CPU

RX Forus packets are replicated on NPU. One is sent to Active RP and another to Stby RP

Inject from RP CPU to NPU or LC CPU

L3 packets are injected directly to NPU if prefix adjacency is complete or it is a pre-route packet

L3 packets are injected to LC CPU in case:

The Prefix adjacency is GLEAN.
MPLS pre-route packet
Packet size exceeds MTU.

Inject Path from LC CPU to NPU

These packets are Injected from LC CPU to NPU:

ARP, ND, ICMP Echo Reply, Fragmented Packets
CDP, LACP, LLDP, Ether-link OAM packets

CLI for Punt/Inject Debugging

Show SPP node counters location <>

show netio chain <interface> location <>

show netio drop location <>

show ipv4/ipv6 traffic location <>

show fwd statistics location <>

show lpts pifib entry brief statistics location <>

show controllers fia diagshell <npu> "diag counters g cdsp" location <>

show interface <> location <>

Remote Ping

Packet Path: Echo Request

Local Node[ICMP(RP) -> IP I/O(RP) -> NetIO/Forwarder(RP) -> SPP(RP) -> NPU] -> wire -> Remote[NPU -> LPTS(HW) -> SPP(LC) -> NetIO/Forwarder(LC) -> LPTS(SW)(LC) -> IP I/O (LC) -> ICMP (LC)]

Packet Path: Echo Reply

Remote Node[IPv4/ICMP (LC) -> FWD/NetIO (LC) -> SPP (LC) -> NPU] -> wire -> Local Node[LPTS(HW) -> SPP(LC) -> NetIO/Forwarder(LC) -> NetIO(RP) -> IP I/O (RP) -> ICMP (RP)]

Local Ping

Packet Path: Echo Request

RP(ICMP/IPv4 IO -> netio -> SPP -> CE) -> LC(SPP -> netio -> ICMP/ipv4 IO)

Packet Path: Echo Reply

LC(IPv4 IO/ICMP -> Netio -> SPP -> CE) -> RP(SPP -> net -> ipv4 io/ICMP)

Useful debugs:

debug icmp ipv4 location 0/0/CPU0

debug ipv4 packet location 0/0/CPU0

debug ipv4 ping events location 0/0/CPU0

Topology

Fretta_1(GigabitEthernet0/0/0/16 ) <---->(GigabitEthernet0/0/0/16 ) Fretta_2



RP/0/RP0/CPU0:fretta_1#  ping 1.1.16.2 count 10000

Commands to check Remote Ping

Echo Request: Local RP: TX

Path: ICMP(RP) -> IP I/O(RP) -> NetIO/Forwarder(RP) -> SPP(RP) -> NPU

1. IP I/O: Check if Echo Request is generated:

show ipv4 traffic brief

ICMP statistics:
  Sent: 0 admin unreachable, 0 network unreachable
        0 host unreachable, 0 protocol unreachable
        0 port unreachable, 0 fragment unreachable
        0 time to live exceeded, 0 reassembly ttl exceeded
        10000 echo request, 0 echo reply
        0 mask request, 0 mask reply
        0 parameter error, 0 redirects
        10000 total

2. NetIO

RP/0/RP0/CPU0:fretta_1#show netio clients location 0/rP0/CPU0 

Counters                  Errors/Total  
----------------------------------------
Output                        0/10019  
Input                         0/11804   
Puntback                      0/0       
Jump                          0/0       
Driver Output                 0/10002   

Mutex Bypass Counters        Total      
----------------------------------------
Egress handled               0           
Egress chainwalked           10006       
Egress dropped               0           
Ingress handled              10000       
Ingress chainwalked          0           
Ingress dropped              0           



ClientID         Drop/Total        Drop/Total      Cur/High/Max    Cur/High/Max 
--------------------------------------------------------------------------------
ipv6_icmp           0/0               0/0             0/0/1000        0/0/1000  
icmp                0/10000           0/0             0/1/1000        0/0/1000  




If ping is failing then check if it is getting dropped in Netio:

RP/0/RP0/CPU0:fretta_1#show netio drops location 0/rP0/CPU0 
Thu Apr 20 20:28:09.577 UTC

Drops for interfaces on node 0/RP0/CPU0

No drops

3. SPP

RP/0/RP0/CPU0:fretta_1#show spp node-counters 
Thu Apr 20 20:29:05.785 UTC
0/0/CPU0:
fretta/classify
      forwarded to spp clients:           10006
 forwarded NPU packet to NetIO:           10006
      dropped in classify node:              24
         Fwded to CoPP sampler:               1
                      PUNT ARP:               1
                     PUNT IFIB:           10006
                IFIB RAWIP4_FM:           10000
                IFIB RAWIP6_FM:               6
-------------------------------
client/inject
        pkts injected into spp:           10002
  NetIO->NPU injected into spp:               2
  NetIO->CPU injected into spp:           10000
          NetIO->NPU PROTO ARP:               2
           NetIO->CPU PKT LPTS:           10000
-------------------------------
socket/rx
                ether raw pkts:           10031
-------------------------------
socket/tx
                       ce pkts:           10002
-------------------------------
client/punt
              punted to client:           10007
-------------------------------

0/RP0/CPU0:
socket/rx
                ether raw pkts:           10002
           mgmt interface pkts:            3204
-------------------------------
socket/tx
                       ce pkts:           10000
           mgmt interface pkts:               5
-------------------------------
fretta/classify
      forwarded to spp clients:           13204
 forwarded CPU packet to NetIO:           10000
forwarded Mgmt packet to NetIO:            3204
      dropped in classify node:               2
-------------------------------
client/inject
        pkts injected into spp:           10005
  NetIO->NPU injected into spp:           10000
     MGMT_IF injected into spp:               5
NetIO->NPU PROTO IPV4_PREROUTE:           10000
-------------------------------
client/punt
              punted to client:           13204
-------------------------------

4. Check if Echo Request is sent out to wire:

 RP/0/RP0/CPU0:fretta_1#show controllers gigabitEthernet 0/0/0/16 stats | be Egress
Thu Apr 20 21:17:28.176 UTC

Egress:
    Output total bytes          = 1140270
        Output good bytes           = 1140270

    Output total packets        = 10004
    Output 802.1Q frames        = 0
    Output pause frames         = 0
    Output pkts 64 bytes        = 1
    Output pkts 65-127 bytes    = 10003
    Output pkts 128-255 bytes   = 0
    Output pkts 256-511 bytes   = 0
    Output pkts 512-1023 bytes  = 0
    Output pkts 1024-1518 bytes = 0
    Output pkts 1519-Max bytes  = 0

    Output good pkts            = 10004
    Output unicast pkts         = 10000
    Output multicast pkts       = 3
    Output broadcast pkts       = 1

    Output drop underrun        = 0
    Output drop abort           = 0
    Output drop other           = 0

    Output error other          = 0

Echo Request: Remote LC: RX

Path: NPU -> LPTS(HW) -> SPP(LC) -> NetIO/Forwarder(LC) -> LPTS(SW)(LC) -> IP I/O (LC) -> ICMP (LC)

1. Check if the packet is received from wire:

RP/0/RP0/CPU0:fretta_2#show controllers gigabitEthernet 0/0/0/16 stats 
Thu Apr 20 20:44:22.115 UTC
Statistics for interface GigabitEthernet0/0/0/16 (cached values):

Ingress: 
    Input total bytes           = 1140270
    Input good bytes            = 1140270

    Input total packets         = 10004
    Input 802.1Q frames         = 0
    Input pause frames          = 0
    Input pkts 64 bytes         = 1
    Input pkts 65-127 bytes     = 10003

2. Check LPTS counter.

RP/0/RP0/CPU0:fretta_2#show lpts pifib hardware entry brief location 0/0/CPU0 | i ICMP
Thu Apr 20 20:45:54.687 UTC

DestIP               SrcIP                vrf   L4   LPort/Type   RPort  npu  Flowtype           DestNode     PuntPrio Accept Drop  
0.0.0.0              0.0.0.0              0     1    ECHO         0      0    ICMP-local         Local LC     MEDIUM   10000  0

3. SPP

RP/0/RP0/CPU0:fretta_2#show spp node-counters location 0/0/CPU0

fretta/classify
      forwarded to spp clients:           10006
 forwarded NPU packet to NetIO:           10006
      dropped in classify node:              22
         Fwded to CoPP sampler:               2
                      PUNT ARP:               2
                     PUNT IFIB:           10006
               IFIB IPv4_STACK:           10000
                IFIB RAWIP6_FM:               6
-------------------------------
client/inject
        pkts injected into spp:           10002
  NetIO->NPU injected into spp:           10002
          NetIO->NPU PROTO ARP:               2
         NetIO->NPU PROTO IPV4:           10000
-------------------------------
socket/rx
                ether raw pkts:           10030
-------------------------------
socket/tx
                       ce pkts:           10002
-------------------------------
client/punt
              punted to client:           10008
-------------------------------

4. Netio

show netio chains gigabitEthernet 0/0/0/16 location 0/0/cpu0

<12> (ipv4)   Stats IN: 10000 pkts, 1140000 bytes; OUT: 10000 pkts, 1140000 bytes

       Protocol        SAFI       Pkts In    Bytes In    Pkts Out   Bytes Out
---------------  ----------    ----------  ----------  ----------  ----------
           ipv4     Unicast         10000     1140000       10000     1000000
           ipv4   Multicast             0           0           0           0
           ipv4   Broadcast             0           0           0           0
           ipv6     Unicast             0           0           0           0
           ipv6   Multicast             0           0           0           0

RP/0/RP0/CPU0:fretta_2#show netio clients location 0/0/CPU0 
Thu Apr 20 20:52:26.802 UTC

Counters                  Errors/Total  
----------------------------------------
Output                        0/10002   
Input                         0/10008   
Puntback                      0/0       
Jump                          0/0       
Driver Output                 0/10002   

XIPC queues              Dropped/Queued    Cur/High/Max 
------------------------------------------------------------
OutputL                       0/10000         0/1/6000  
OutputH                       0/2             0/1/3000  
Puntback                      0/0             0/0/6000  

                   Input              Punt         XIPC InputQ      XIPC PuntQ  
ClientID         Drop/Total        Drop/Total      Cur/High/Max    Cur/High/Max 
--------------------------------------------------------------------------------
ipv6_icmp           0/0               0/0             0/0/1000        0/0/1000  
icmp                0/10000           0/0             0/1/1000        0/0/1000  
clns              L 0/0               0/0           L 0/0/1000        0/0/0     
                  H 0/0                             H 0/0/1000                  
ipv6_io             0/0               0/0             0/0/1000        0/0/1000  
ipv6_nd             0/0               0/0             0/0/1500        0/0/1000  
l2snoop             0/0               0/0             0/0/1000        0/0/0     
ether_sock          0/0               0/0        
tp_oam              0/0               0/0             0/0/1000        0/0/1000  
icmpv6_unreach_jump        0/0               0/0        
arp                 0/2               0/0             0/1/1000        0/0/1000  
mpls_io             0/0               0/0             0/0/1000        0/0/1000  
ipv4                0/0               0/0             0/0/1000        0/0/1000  
ipv6                0/0               0/0             0/0/1000        0/0/1000  

Key:
  L = queue for lower priority packets
  H = queue for higher priority packets

5. FWD stats

RP/0/RP0/CPU0:fretta_2#show fwd statistics all location 0/0/cpu0
Thu Apr 20 20:51:50.347 UTC
RECEIVE STATISTICS SUMMARY:
rx_pkts: 10008 
punt_pkts: 10008 
ingress_total_drops: 0 
TRANSMIT STATISTICS SUMMARY:
inject_pkts: 10002 
tx_pkts: 10002 
egress_total_drops: 0 
RP/0/RP0/CPU0:fretta_2#

6. IP IOS

show ipv4 traffic brief location 0/0/CPU0

 Rcvd: 0 admin unreachable, 0 network unreachable
        0 host unreachable, 0 protocol unreachable
        0 port unreachable, 0 fragment unreachable
        0 time to live exceeded, 0 reassembly ttl exceeded
        10000 echo request, 0 echo reply
        0 mask request, 0 mask reply
        0 redirect, 0 parameter error
        0 source quench, 0 timestamp, 0 timestamp reply
        0 router advertisement, 0 router solicitation
        10000 total, 0 checksum errors, 0 unknown

Echo Reply: Remote Node(LC): TX

Path: IPv4/ICMP (LC) -> FWD/NetIO (LC) -> SPP (LC) -> NPU

1. IP IO

RP/0/RP0/CPU0:fretta_2#show ipv4 traffic brief location 0/0/CPU0

ICMP statistics:
  Sent: 0 admin unreachable, 0 network unreachable
        0 host unreachable, 0 protocol unreachable
        0 port unreachable, 0 fragment unreachable
        0 time to live exceeded, 0 reassembly ttl exceeded
        0 echo request, 10000 echo reply
        0 mask request, 0 mask reply
        0 parameter error, 0 redirects
        10000 total

2. Netio

show netio chains gigabitEthernet 0/0/0/16 location 0/0/cpu0

<12> (ipv4)   Stats IN: 10000 pkts, 1140000 bytes; OUT: 10000 pkts, 1140000 bytes

       Protocol        SAFI       Pkts In    Bytes In    Pkts Out   Bytes Out
---------------  ----------    ----------  ----------  ----------  ----------
           ipv4     Unicast         10000     1140000       10000     1000000
           ipv4   Multicast             0           0           0           0
           ipv4   Broadcast             0           0           0           0
           ipv6     Unicast             0           0           0           0
           ipv6   Multicast             0           0           0           0

RP/0/RP0/CPU0:fretta_2#show netio clients location 0/0/CPU0 
Thu Apr 20 20:52:26.802 UTC

Counters                  Errors/Total  
----------------------------------------
Output                        0/10002   
Input                         0/10008   
Puntback                      0/0       
Jump                          0/0       
Driver Output                 0/10002   

XIPC queues              Dropped/Queued    Cur/High/Max 
------------------------------------------------------------
OutputL                       0/10000         0/1/6000  
OutputH                       0/2             0/1/3000  
Puntback                      0/0             0/0/6000

3. FWD Stats

 RP/0/RP0/CPU0:fretta_2#show fwd statistics all location 0/0/cpu0
Thu Apr 20 20:51:50.347 UTC
RECEIVE STATISTICS SUMMARY:
rx_pkts: 10008 
punt_pkts: 10008 
ingress_total_drops: 0 
TRANSMIT STATISTICS SUMMARY:
inject_pkts: 10002 
tx_pkts: 10002 
egress_total_drops: 0

4. SPP

 show spp node-counters location 0/0/CPU0

fretta/classify
      forwarded to spp clients:           10006
 forwarded NPU packet to NetIO:           10006
      dropped in classify node:              22
         Fwded to CoPP sampler:               2
                      PUNT ARP:               2
                     PUNT IFIB:           10006
               IFIB IPv4_STACK:           10000
                IFIB RAWIP6_FM:               6
-------------------------------
client/inject
        pkts injected into spp:           10002
  NetIO->NPU injected into spp:           10002
          NetIO->NPU PROTO ARP:               2
         NetIO->NPU PROTO IPV4:           10000
-------------------------------
socket/rx
                ether raw pkts:           10030
-------------------------------
socket/tx
                       ce pkts:           10002
-------------------------------
client/punt
              punted to client:           10008
-------------------------------

5. Check if the packet is sent out to wire.

RP/0/RP0/CPU0:fretta_2#show controllers gigabitEthernet 0/0/0/16 stats 
Thu Apr 20 21:20:22.593 UTC
Statistics for interface GigabitEthernet0/0/0/16 (cached values):
Egress:
    Output total bytes          = 1140270
    Output good bytes           = 1140270

    Output total packets        = 10004
    Output 802.1Q frames        = 0
    Output pause frames         = 0
    Output pkts 64 bytes        = 1
    Output pkts 65-127 bytes    = 10003
    Output pkts 128-255 bytes   = 0
    Output pkts 256-511 bytes   = 0
    Output pkts 512-1023 bytes  = 0
    Output pkts 1024-1518 bytes = 0
    Output pkts 1519-Max bytes  = 0

    Output good pkts            = 10004
    Output unicast pkts         = 10000
    Output multicast pkts       = 3
    Output broadcast pkts       = 1

    Output drop underrun        = 0
    Output drop abort           = 0
    Output drop other           = 0

    Output error other          = 0

6. Interface stats

RP/0/RP0/CPU0:fretta_2#show int gigabitEthernet 0/0/0/16
Thu Apr 20 21:21:37.942 UTC
GigabitEthernet0/0/0/16 is up, line protocol is up 
  Interface state transitions: 1
  Hardware is GigabitEthernet, address is 008a.964a.7040 (bia 008a.964a.7040)
  Internet address is 1.1.16.2/24
  MTU 1514 bytes, BW 1000000 Kbit (Max: 1000000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 1000Mb/s, 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 01:00:13
  ARP type ARPA, ARP timeout 04:00:00
  Last input 00:56:58, output 00:56:58
  Last clearing of "show interface" counters never
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     10004 packets input, 1140270 bytes, 0 total input drops
     3 drops for unrecognized upper-level protocol
     Received 1 broadcast packets, 3 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     10004 packets output, 1140270 bytes, 0 total output drops
     Output 1 broadcast packets, 3 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

Echo Reply: Local Node(LC): RX

LPTS(HW) -> SPP(LC) -> NetIO/Forwarder(LC) -> LPTS PreIFIB Lookup -> SPP(LC) -> CE(LC) -> SPP(RP) -> NetIO(RP) -> IP I/O (RP) -> ICMP (RP)

1. Check if packets are coming in from wire.

RP/0/RP0/CPU0:fretta_1#show controllers gigabitEthernet 0/0/0/16 stats 
Thu Apr 20 21:17:28.176 UTC
Statistics for interface GigabitEthernet0/0/0/16 (cached values):

Ingress: 
    Input total bytes           = 1140270
    Input good bytes            = 1140270

    Input total packets         = 10004
    Input 802.1Q frames         = 0
    Input pause frames          = 0
    Input pkts 64 bytes         = 1
   Input pkts 65-127 bytes     = 10003
    Input pkts 128-255 bytes    = 0
    Input pkts 256-511 bytes    = 0
    Input pkts 512-1023 bytes   = 0
    Input pkts 1024-1518 bytes  = 0
    Input pkts 1519-Max bytes   = 0

    Input good pkts             = 10004
    Input unicast pkts          = 10000
    Input multicast pkts        = 3
    Input broadcast pkts        = 1

    Input drop overrun          = 0
    Input drop abort            = 0
    Input drop invalid VLAN     = 0
    Input drop invalid DMAC     = 0
    Input drop invalid encap    = 0
    Input drop other            = 0

    Input error giant           = 0
    Input error runt            = 0
    Input error jabbers         = 0
    Input error fragments       = 0
    Input error CRC             = 0
    Input error collisions      = 0
    Input error symbol          = 0
    Input error other           = 0

    Input MIB giant             = 0
    Input MIB jabber            = 0
    Input MIB CRC               = 0

2. LPTS Counters

RP/0/RP0/CPU0:fretta_1#show lpts pifib hardware entry brief locatio 0/0/CPU0

0.0.0.0              0.0.0.0              0     1    ECHOREPLY    0      0    ICMP-app-default   Local LC     LOW      10000  0

3. SPP on LC

RP/0/RP0/CPU0:fretta_1#show spp node-counters location 0/0/CPU0 
Thu Apr 20 21:01:31.974 UTC
fretta/classify
      forwarded to spp clients:           10006
 forwarded NPU packet to NetIO:           10006
      dropped in classify node:              24
         Fwded to CoPP sampler:               1
                      PUNT ARP:               1
                     PUNT IFIB:           10006
                IFIB RAWIP4_FM:           10000
                IFIB RAWIP6_FM:               6
-------------------------------
client/inject
        pkts injected into spp:           10002
  NetIO->NPU injected into spp:               2
  NetIO->CPU injected into spp:           10000
          NetIO->NPU PROTO ARP:               2
           NetIO->CPU PKT LPTS:           10000
-------------------------------
socket/rx
                ether raw pkts:           10031
-------------------------------
socket/tx
                       ce pkts:           10002
-------------------------------
client/punt
              punted to client:           10007
-------------------------------

4. Netio on LC

RP/0/RP0/CPU0:fretta_1# show netio chains gigabitEthernet 0/0/0/16 location 0/0/cpu0

<12> (ipv4)   Stats IN: 10000 pkts, 1140000 bytes; OUT: 0 pkts, 0 bytes

Protocol SAFI counts:
--------------------

       Protocol        SAFI       Pkts In    Bytes In    Pkts Out   Bytes Out
---------------  ----------    ----------  ----------  ----------  ----------
           ipv4     Unicast         10000     1140000           0           0
           ipv4   Multicast             0           0           0           0
           ipv4   Broadcast             0           0           0           0
           ipv6     Unicast             0           0           0           0
           ipv6   Multicast             0           0           0           0

5. FWD stats on LC.

RP/0/RP0/CPU0:fretta_1#show fwd statistics all location 0/0/CPU0 
Thu Apr 20 21:04:27.767 UTC
RECEIVE STATISTICS SUMMARY:
rx_pkts: 10007 
punt_pkts: 10007 
ingress_total_drops: 0 
TRANSMIT STATISTICS SUMMARY:
inject_pkts: 10002 
tx_pkts: 10002 
egress_total_drops: 0 
RP/0/RP0/CPU0:fretta_1#

5. SPP on LC to send to SPP on RP.

RP/0/RP0/CPU0:fretta_1#show spp node-counters location 0/0/CPU0 
Thu Apr 20 21:01:31.974 UTC
fretta/classify
      forwarded to spp clients:           10006
 forwarded NPU packet to NetIO:           10006
      dropped in classify node:              24
         Fwded to CoPP sampler:               1
                      PUNT ARP:               1
                     PUNT IFIB:           10006
                IFIB RAWIP4_FM:           10000
                IFIB RAWIP6_FM:               6
-------------------------------
client/inject
        pkts injected into spp:           10002
  NetIO->NPU injected into spp:               2
  NetIO->CPU injected into spp:           10000
          NetIO->NPU PROTO ARP:               2
           NetIO->CPU PKT LPTS:           10000
-------------------------------
socket/rx
                ether raw pkts:           10031
-------------------------------
socket/tx
                       ce pkts:           10002
-------------------------------
client/punt
              punted to client:           10007
-------------------------------

6. SPP on RP

RP/0/RP0/CPU0:fretta_1#show spp node-counters location 0/rP0/CPU0 
Thu Apr 20 21:06:33.045 UTC
socket/rx
                ether raw pkts:           10002
           mgmt interface pkts:           16651
-------------------------------
socket/tx
                       ce pkts:           10000
           mgmt interface pkts:              14
-------------------------------
fretta/classify
      forwarded to spp clients:           26651
 forwarded CPU packet to NetIO:           10000
forwarded Mgmt packet to NetIO:           16651
      dropped in classify node:               2
-------------------------------
client/inject
        pkts injected into spp:           10014
  NetIO->NPU injected into spp:           10000
     MGMT_IF injected into spp:              14
NetIO->NPU PROTO IPV4_PREROUTE:           10000
-------------------------------
client/punt
              punted to client:           26651
-------------------------------

7. Netio on RP.

RP/0/RP0/CPU0:fretta_1#show netio clients location 0/RP0/CPU0
Thu Apr 20 21:05:05.977 UTC

Counters                  Errors/Total  
----------------------------------------
Output                        0/10031   
Input                         0/25872   
Puntback                      0/0       
Jump                          0/0       
Driver Output                 0/10014   

Mutex Bypass Counters        Total      
----------------------------------------
Egress handled               0           
Egress chainwalked           10018       
Egress dropped               0           
Ingress handled              10000       
Ingress chainwalked          0           
Ingress dropped              0           

XIPC queues              Dropped/Queued    Cur/High/Max 
------------------------------------------------------------
OutputL                       0/10004         0/1/6000  
OutputH                       0/14            0/1/3000  
Puntback                      0/0             0/0/6000  
PMutex_egressL                0/10004         0/1/6000  
PMutex_egressH                0/14            0/1/1500  
PMutex_ingressL               0/0             0/0/6000  
PMutex_ingressH               0/0             0/0/1500  

                   Input              Punt         XIPC InputQ      XIPC PuntQ  
ClientID         Drop/Total        Drop/Total      Cur/High/Max    Cur/High/Max 
--------------------------------------------------------------------------------
ipv6_icmp           0/0               0/0             0/0/1000        0/0/1000  
icmp                0/10000           0/0             0/1/1000        0/0/1000  
clns              L 0/0               0/0           L 0/0/1000        0/0/0     
                  H 0/0                             H 0/0/1000                  
eth_mgmt            0/0               0/0        
ipv6_io             0/0               0/4             0/0/1000        0/1/1000  
ipv6_nd             0/4               0/0             0/1/1500        0/0/1000  
l2snoop             0/0               0/0             0/0/1000        0/0/0     
ether_sock          0/0               0/0        
icmpv6_unreach_jump        0/0               0/0        
raw               L 0/0               0/0           L 0/0/1600        0/0/0     
                  H 0/0                             H 0/0/1600                  
tcp               L 0/0               0/0           L 0/0/1600        0/0/0     
                  H 0/0                             H 0/0/1600                  
udp               L 0/307             0/0           L 0/1/1600        0/0/0     
                  H 0/0                             H 0/0/1600                  
arp                 0/15565           0/0             0/4/1000        0/0/1000  
mpls_io             0/0               0/0             0/0/1000        0/0/1000  
lspv_server         0/0               0/0        
ipv4                0/0               0/0             0/0/1000        0/0/1000  
ipv6                0/0               0/0             0/0/1000        0/0/1000  

Key:
  L = queue for lower priority packets
  H = queue for higher priority packets

8. IP IO

RP/0/RP0/CPU0:fretta_1#

RP/0/RP0/CPU0:fretta_1#show ipv4 traffic brief

  Rcvd: 0 admin unreachable, 0 network unreachable
        0 host unreachable, 0 protocol unreachable
        0 port unreachable, 0 fragment unreachable
        0 time to live exceeded, 0 reassembly ttl exceeded
        0 echo request, 10000 echo reply
        0 mask request, 0 mask reply
        0 redirect, 0 parameter error
        0 source quench, 0 timestamp, 0 timestamp reply
        0 router advertisement, 0 router solicitation
        10000 total, 0 checksum errors, 0 unknown

9. Interface stats:

RP/0/RP0/CPU0:fretta_1# show int gigabitEthernet 0/0/0/16
Thu Apr 20 21:22:12.822 UTC
GigabitEthernet0/0/0/16 is up, line protocol is up 
  Interface state transitions: 1
  Hardware is GigabitEthernet, address is 008a.964b.7040 (bia 008a.964b.7040)
  Internet address is 1.1.16.1/24
  MTU 1514 bytes, BW 1000000 Kbit (Max: 1000000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 1000Mb/s, 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 01:01:11
  ARP type ARPA, ARP timeout 04:00:00
  Last input 00:58:03, output 00:58:03
  Last clearing of "show interface" counters never
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     10004 packets input, 1140270 bytes, 0 total input drops
     3 drops for unrecognized upper-level protocol
     Received 1 broadcast packets, 3 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     10004 packets output, 1140270 bytes, 0 total output drops
     Output 1 broadcast packets, 3 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/RP0/CPU0:fretta_1#

Local Ping

<TBD>

Revision History

Revision	Publish Date	Comments
1.0	01-Aug-2021	Initial Release

Contributed by

Santosh Sharma
Cisco Engineering

NCS5500: Life of a Packet(Transit, Punt/Inject, Ping Path)

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Contents

Introduction

Life of a Packet in Forwarding ASIC

Pipeline Forwarding ASIC

IRPP (Port Term, Parser)

Punt Path

Punt Path between two CPU nodes

Punt Path from NPU to RP CPU

Inject from RP CPU to NPU or LC CPU

Inject Path from LC CPU to NPU

CLI for Punt/Inject Debugging

Remote Ping

Packet Path: Echo Request

Packet Path: Echo Reply

Local Ping

Packet Path: Echo Request

Packet Path: Echo Reply

Useful debugs:

Topology

Commands to check Remote Ping

Echo Request: Local RP: TX

Echo Request: Remote LC: RX

Echo Reply: Remote Node(LC): TX

Echo Reply: Local Node(LC): RX

Local Ping

Revision History

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