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CCNPv6 TSHOOT Section 2 Troubleshooting Reference Information General Troubleshooting Process As a general guideline, you can use the following general troubleshooting process described in the course. 1. Define the problem (symptoms). 2. Gather information. 3. Analyze the information. 4. Propose a hypothesis (possible cause). 5. Test the hypothesis. 6. Eliminate or accept the hypothesis. 7. Solve the problem. 8. Document the problem. Command Summary The table lists useful commands for this lab. The sample output is shown on following pages. Command Key Information Displayed show ip dhcp snooping debug ip dhcp snooping packet debug ip dhcp server packet show ip eigrp neighbors sh ip eigrp interfaces show ip eigrp interfaces detail debug eigrp packets Displays snooping status (enabled or not) and, if enabled, on which VLANs. Also shows which interfaces are trusted. Displays real-time information on DHCP snooping activity and the client/server exchange. Displays real-time information on DHCP on the client/server exchange from the server perspective. Displays the IP address of EIGRP neighbors and the interface on which they were learned. Displays all interfaces participating in EIGRP for each AS and the number of peers associated with each interface. Displays all interfaces participating in EIGRP for each AS along with the number of peers, hello interval, and the type of authentication (if configured). Displays real-time information on types of EIGRP packets exchange, which include authentication information. All contents are Copyright © 1992–2010 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 8 of 17
CCNPv6 TSHOOT Sample Troubleshooting Output DHCP Snooping-related Commands The following commands and outputs are provided as samples from the devices in this lab. ALS1#show ip dhcp snooping Switch DHCP snooping is enabled DHCP snooping is configured on following VLANs: 10 DHCP snooping is operational on following VLANs: 10 DHCP snooping is configured on the following L3 Interfaces: Insertion of option 82 is enabled circuit-id format: vlan-mod-port remote-id format: MAC Option 82 on untrusted port is not allowed Verification of hwaddr field is enabled Verification of giaddr field is enabled DHCP snooping trust/rate is configured on the following Interfaces: Interface Trusted Rate limit (pps) ------------------------ ------- ---------------- FastEthernet0/1 yes unlimited FastEthernet0/2 yes unlimited FastEthernet0/3 yes unlimited FastEthernet0/4 yes unlimited Port-channel1 yes unlimited Port-channel2 yes unlimited In the above example, DHCP snooping is operational on ALS1 VLAN 10, and Fa0/1 through Fa0/4 (port channels Po1 and Po2) are trusted. DLS1#show ip dhcp snooping Switch DHCP snooping is disabled DHCP snooping is configured on following VLANs: none DHCP snooping is operational on following VLANs: none DHCP snooping is configured on the following L3 Interfaces: Insertion of option 82 is enabled circuit-id format: vlan-mod-port remote-id format: MAC Option 82 on untrusted port is not allowed Verification of hwaddr field is enabled Verification of giaddr field is enabled DHCP snooping trust/rate is configured on the following Interfaces: Interface Trusted Rate limit (pps) ------------------------ ------- ---------------- In the above example, Option 82 on untrusted port is not allowed, and no interfaces are trusted. All contents are Copyright © 1992–2010 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 9 of 17
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CCNP TSHOOT 6.0 Student Lab Manual
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CCNPv6 TSHOOT Objectives • Assign
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CCNPv6 TSHOOT Note: When the show f
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CCNPv6 TSHOOT Step 10: Test basic n
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CCNPv6 TSHOOT b. If working as a te
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CCNPv6 TSHOOT Subnet Table Descript
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CCNPv6 TSHOOT Task 5: Identify Trou
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CCNPv6 TSHOOT Router Interface Summ
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CCNPv6 TSHOOT switchport trunk allo
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CCNPv6 TSHOOT ! interface FastEther
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CCNPv6 TSHOOT Switch DLS1 !Lab 3-1
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CCNPv6 TSHOOT switchport nonegotiat
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CCNPv6 TSHOOT switchport access vla
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CCNPv6 TSHOOT ! logging source-inte
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CCNPv6 TSHOOT interface Port-channe
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CCNPv6 TSHOOT switchport mode acces
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CCNPv6 TSHOOT ip address 10.1.100.2
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CCNPv6 TSHOOT no shutdown ! interfa
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CCNPv6 TSHOOT ! interface Serial0/0
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CCNPv6 TSHOOT ip flow ingress encap
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Logical Topology Objectives Backgro
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CCNPv6 TSHOOT Section 1—Trouble T
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CCNPv6 TSHOOT Device Actions and Re
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CCNPv6 TSHOOT Note: In addition to
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CCNPv6 TSHOOT Default gateway: 10.1
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CCNPv6 TSHOOT Section 2—Troublesh
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CCNPv6 TSHOOT • Address Resolutio
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CCNPv6 TSHOOT • Spanning-tree top
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CCNPv6 TSHOOT Sample Layer 2 Troubl
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CCNPv6 TSHOOT After you have found
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CCNPv6 TSHOOT ALS1#show etherchanne
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CCNPv6 TSHOOT Lab 4-1: References I
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CCNPv6 TSHOOT Logical Topology Obje
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CCNPv6 TSHOOT Step 3: Configure SRV
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CCNPv6 TSHOOT Sample Multilayer Swi
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CCNPv6 TSHOOT epoch 0 sourced in se
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CCNPv6 TSHOOT Troubleshooting First
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CCNPv6 TSHOOT Sample First Hop Redu
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CCNPv6 TSHOOT Sample First Hop Redu
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CCNPv6 TSHOOT References If you nee
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CCNPv6 TSHOOT Section 2 - Troublesh
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CCNPv6 TSHOOT Layer 3 is a common s
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CCNPv6 TSHOOT reachability of the n
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CCNPv6 TSHOOT associated egress int
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CCNPv6 TSHOOT The usual trigger to
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CCNPv6 TSHOOT Specifically, the %DU
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CCNPv6 TSHOOT Hop count is 2 10.1.1
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CCNPv6 TSHOOT If you find that an E
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CCNPv6 TSHOOT Logical Topology (Bas
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CCNPv6 TSHOOT Phase 1 OSPF Network
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CCNPv6 TSHOOT After the completion
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CCNPv6 TSHOOT R3 Lab51-R3-TT-C-Cfg.
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CCNPv6 TSHOOT Task 4: Trouble Ticke
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CCNPv6 TSHOOT Step 7: Document trou
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CCNPv6 TSHOOT debug ip ospf packet
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CCNPv6 TSHOOT R1#show ip ospf inter
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CCNPv6 TSHOOT • Area ID (aid): Th
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CCNPv6 TSHOOT Nov 5 16:06:39.809: O
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CCNPv6 TSHOOT Sample OSPF Troublesh
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CCNPv6 TSHOOT LS Type: Summary Link
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CCNPv6 TSHOOT Boundary (ASB) entry
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CCNPv6 TSHOOT Sample Route Redistri
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CCNPv6 TSHOOT Reflection Questions
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CCNPv6 TSHOOT Chapter 5 Lab 5-3, BG
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CCNPv6 TSHOOT ISP, it has been deci
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CCNPv6 TSHOOT Lab Structure This la
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CCNPv6 TSHOOT Step 5: Outline the t
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CCNPv6 TSHOOT Device Configuration
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CCNPv6 TSHOOT The typical trigger t
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CCNPv6 TSHOOT • Number of receive
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CCNPv6 TSHOOT You can use the debug
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CCNPv6 TSHOOT Sample BGP Troublesho
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CCNPv6 TSHOOT 172.24.244.86 (metric
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CCNPv6 TSHOOT Sample BGP Troublesho
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CCNPv6 TSHOOT Logical Topology (Bas
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CCNPv6 TSHOOT Physical and Logical
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CCNPv6 TSHOOT Device Configuration
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CCNPv6 TSHOOT debug dhcp detail deb
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CCNPv6 TSHOOT R2#debug ip icmp Nov
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CCNPv6 TSHOOT Chapter 7 Lab 7-1, Ro
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