CCNP TSHOOT Learning Guide/Chapter 4

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< CCNP TSHOOT Learning Guide
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Maintaining and troubleshooting Campus Switched Solutions

VLAN Troubleshooting

Layer 2 reviewing

ARP

  • show mac-addresses
SW1#<input>show mac-address-table</input>
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
 All    0100.0ccc.cccc    STATIC      CPU
 All    0100.0ccc.cccd    STATIC      CPU
<notice>...OUTPUT OMITTED...</notice>
   1    001b.0cba.4f99    DYNAMIC     Gi0/9
   1    001b.2a32.2e99    DYNAMIC     Gi0/5
   1    0021.5a7c.5549    DYNAMIC     Gi0/4
   1    00a0.d1e6.60b4    DYNAMIC     Gi0/22
  41    0014.f273.96c0    DYNAMIC     Gi0/7
<notice>...OUTPUT OMITTED...</notice>
  41    001b.0cb6.9141    DYNAMIC     Gi0/7
  41    001b.0cba.4fc1    DYNAMIC     Gi0/9
  41    001b.2a32.2ec1    DYNAMIC     Gi0/5
  12    001f.297d.3460    DYNAMIC     Gi0/2
  20    00a0.c543.035d    DYNAMIC     Gi0/6
  22    0003.47ca.d67c    DYNAMIC     Gi0/7
  22    000c.296c.1120    DYNAMIC     Gi0/12
  24    0016.769f.ff4e    DYNAMIC     Gi0/8
  28    0013.2085.a1fe    DYNAMIC     Gi0/9
  28    0013.2085.c447    DYNAMIC     Gi0/9
<notice>...OUTPUT OMITTED...</notice>

Troubleshooting layer 2

  • Hardware issues (move cable to good port)
  • VLAN configuration.
    • Inter-VLAN traffic must be routed
  • Trunk configuration
    • Same trunkprotocol (DOT1Q,ISL)
    • Same Native VLAN

Verifying Layer 2 Forwarding

Often used commands

  • show mac-address-table
  • show vlan
  • show interface trunk
  • show interface switchport
  • show platform forward interface - Example below
  • traceroute mac - Example below

show platform forward interface example

Show how the switch will direct traffic 

SW1#<input>show platform forward gigabitEthernet 0/1 vlan 1 0021.5a7c.5549 001b.2a32.2e99</input>
Ingress:
Global Port Number: 1, lpn: 3 Asic Number: 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
Hashes: L2Src 0x00 L2Dst 0x09 L3Src 0x00 L3Dst 0x09
 Lookup                   Key-Used                  Index-Hit    A-Data
Classify 68_0070001B_2A322E99-00_00000021_5A7C5549     00FFC   00000000
InputACL 20_0070001B_2A322E99-00_00000021_5A7C5549     01FF8   01000000
L2LrnMsk FF_03FFFFFF_FFFFFFFF-00_000003FF_00000000
L2Learn  83_00010021_5A7C5549-93_00000401_00000000     01840   00000000
L2FwdMsk FF_03FFFFFF_FFFFFFFF
L2Fwd    83_0001001B_2A322E99                          0003E   000000C5
Station Descriptor: F005F001, DestIndex: F005, RewriteIndex: F001
==========================================
Egress: Asic 0, switch 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
portMap 0x4, non-SPAN portMap 0x4

Output Packets:
------------------------------------------
GigabitEthernet0/5 Packet 1
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070001B_2A322E99-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/5      0001 0021.5a7c.5549  001b.2a32.2e99

Between two MAC-addresses in two different VLANs in a layer 3 switch 

SW1#<input>show platform forward gigabitEthernet 0/1 vlan 1 0021.5a7c.5549 000c.29ca.39dd</input>
Ingress:
Global Port Number: 1, lpn: 3 Asic Number: 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
Hashes: L2Src 0x00 L2Dst 0x0A L3Src 0x00 L3Dst 0x0A
 Lookup                   Key-Used                  Index-Hit    A-Data
Classify 68_0070000C_29CA39DD-00_00000021_5A7C5549     00FFC   00000000
InputACL 20_0070000C_29CA39DD-00_00000021_5A7C5549     01FF8   01000000
L2LrnMsk FF_03FFFFFF_FFFFFFFF-00_000003FF_00000000
L2Learn  83_00010021_5A7C5549-93_00000401_00000000     01840   00000000
L2FwdMsk FF_03FFFFFF_FFFFFFFF
L2Fwd    83_0001000C_29CA39DD                          01840   0000003C
Station Descriptor: 02E70000, DestIndex: 02E8, RewriteIndex: F001
==========================================
Egress: Asic 0, switch 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
portMap 0xF, non-SPAN portMap 0xF

Output Packets:
------------------------------------------
GigabitEthernet0/7 Packet 1
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/7      0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/8 Packet 2
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/8      0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/5 Packet 3
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/5      0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/6 Packet 4
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/6      0001 0021.5a7c.5549  000c.29ca.39dd
==========================================
Egress: Asic 1, switch 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
portMap 0xD, non-SPAN portMap 0xD

Output Packets:
------------------------------------------
GigabitEthernet0/2 Packet 5
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/2      0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/4 Packet 6
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/4      0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/1 Packet 7
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000
Dropped due to failed deja vu check.
==========================================
Egress: Asic 2, switch 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
portMap 0x4, non-SPAN portMap 0x4

Output Packets:
------------------------------------------
GigabitEthernet0/13 Packet 8
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/13     0001 0021.5a7c.5549  000c.29ca.39dd
==========================================
Egress: Asic 3, switch 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
portMap 0xE, non-SPAN portMap 0xE

Output Packets:
------------------------------------------
GigabitEthernet0/11 Packet 9
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/11     0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/12 Packet 10
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/12     0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/9 Packet 11
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/9      0001 0021.5a7c.5549  000c.29ca.39dd
==========================================
Egress: Asic 5, switch 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
portMap 0x9, non-SPAN portMap 0x9

Output Packets:
------------------------------------------
GigabitEthernet0/23 Packet 12
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/23     0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/22 Packet 13
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/22     0001 0021.5a7c.5549  000c.29ca.39dd
==========================================
Egress: Asic 6, switch 1
Source Vlan Id: Real 1, Mapped 1. L2EncapType 0, L3EncapType 3
portMap 0x6, non-SPAN portMap 0x6

Output Packets:
------------------------------------------
GigabitEthernet0/19 Packet 14
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/19     0001 0021.5a7c.5549  000c.29ca.39dd
------------------------------------------
GigabitEthernet0/20 Packet 15
 Lookup                   Key-Used                  Index-Hit    A-Data
OutptACL 30_0070000C_29CA39DD-00_00000021_5A7C5549     01FFC   01000000

Port       Vlan      SrcMac          DstMac    Cos  Dscpv
Gi0/20     0001 0021.5a7c.5549  000c.29ca.39dd
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