Problem：Server 1 can not get ip address.
SW3#show ip dhcp snooping
Switch DHCP snooping is enabled
DHCP snooping is configured on following VLANs:
DHCP snooping is operational on following VLANs:
Smartlog is configured on following VLANs:
Smartlog is operational on following VLANs:
DHCP snooping is configured on the following L3 Interfaces:
Insertion of option 82 is enabled
circuit-id default format: vlan-mod-port
remote-id: 0018.b9da.5300 (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 Allow option Rate limit (pps)
-------------------- ------- ------------ ----------------
Q1：Which material is most helpful
Q2:which packets can help you find the cause
Customer just setup a IPv6 Network, with HSRPv6 on R1 & R2. After setting up, all hosts lose connection.
What would you recommend to your L1 Engineer as a Quick Fix?
CE1 key configuration
standby 1 priority 200
standby 1 preempt
ipv6 nd router-preference low
CE2 key configuration
standby 1 preempt
ipv6 nd router-preference high
I think it is a rouge device because I don't see any problems with the HSRPv6 config. PCs are configured with "ipv6 enable", "ipv6 autoconfig"
The R1 have a "ipv6 nd-preference high" and R2 have "low" if I'm not wrong.
How fast fix the problem?
¡ Shutdown the link between CE2 and PE2.
¡ Shutdown the link between CE1 and PE1.
¡ Configure CE1 with highest HSRPv6 Priority.
¡ Configure CE2 with highest HSRPv6 pirority.
¡ Configure CE2 with low HSRPv6 priority.
¡ Shutdown CE1 interface e0/0.
¡ Shutdown PE2 interface e0/0.
¡ Disable fast-switching on CE's LAN.
¡ Enable fast-switching on CE's LAN.
¡ Change HSRPv1 to HSRPv2 version
SECTION 1 LAYER 2 TECHNOLOGIES
Section 1.1: LAN Access
The following requirements were pre-configured
l VTP is turned off in all switches
l All required VLAN, including access-ports configuration in all relevant switches are provisioned.
l All required SVI interface in all relevant switches (including IP address and subnets mask) are provisioned.
Configure the network in all sites as per the following requirements:
l Access-port must immediately transition to the forwarding state upon link up, as long as they do not receive a BPDU. Use the minimal number of commands per switch to enable this feature.
l If an access-port receive a BPDU, it must automatically shutdown. Use the minimal commands per switch to enable this feature.
l Ports that were shutdown must attempt to automatically recover after 10 minutes.
l None of the switches may generate a TC.
section 1.2: LAN distribution
configure the headquarters’ network as well as the large and medium office networks as per the following requirements:
l all trunks must use dot1q encapsulation
l negotiation of trunking protocol must be disabled in all switches
l distribution switches (SW300, SW301, SW400, SW401, SW500, SW501) must initiate etherchannel negotiation using LACP
l configure layer 2 etherechannel’s number as shown in the ‘diagram 1: main topology’ and ‘diagram 5: layer 2 connections’ (that is use only Po1 and/or Po2)
l ensure that all ports included in etherchannels are effectively in use and bundled in the expected channel
l access switches must see similar output as shown below:
section 1.3: LAN resiliency: spanning-tree
configure the headquarters‘network as per the following requirements:
l SW300 must be the spanning-tree root bridge and must maintain a single spanning-tree instance for the following VLANs: 2000, 2002, 2004, 2006, 2008 (use instance number 2)
SW301 must be the spanning-tree root bridge and must maintain a single spanning-tree instance for the following VLANs: 2001, 2003, 2005, 2007, 2009 (use instance number 1)
l all other VLANs, except 3001, must share the default spanning-tree instance
l ensure that interface E0/2 of SW 300 and SW 301 is a dot1q trunk and that it switches frames for VLAN 3001 only
l SW300, SW301, and SW 310 must not have any blocked ports for any access VLAN (2000-2009)
l SW310 must have the least chance of being elected the root bridge for any VLAN
l none of the three switches may run more than four instance of spanning-tree at any point in time
configure all access switches in both datacenter networks (SW110, SW111, SW210, SW211) as per the following requirements:
l use 32-bit based values for the default port path cost
l all four switches must use the default value for their interface cost
section 1.4: WAN switching technologies
configure the home router R70 as per following requirements:
l the Ethernet WAN link must rely on a layer 2 protocol that supports authentication and layer 3 protocol negotiation
l the service provider expects that R70 completes a three-way handshake by providing the expected response of a challenge requested
l R70 must use the hostname “R70”and password “CCIE” (without quotes)
l R70 must receive an IP address from R8 and must install a default route pointing to 220.127.116.11
l ensure that R70 can successfully ping 18.104.22.168, which is located in the ISP#2 cloud
l you are not allowed to configure any static route in R70 in order to achieve the previous requirements
l use the pre-configured Dialer 1 interface as appropriate
section 2 layer 3 technologies
section 2.1: OSPF in HQ
configure the headquarters network (BGP AS#65003) as per the following requirements:
l both gateway routers of the headquarters network must always advertise a default route into the ospf domain
l all four devices produce the exact same output as shown below. everything must match, except the “dead time” counters and line order
section 2.2: OSPF in DC#1
in order to speed up OSPF convergence in the datacenter#1 network, limit the number of IP prefixes that are carried in OSPF LSAs that OSPF is preconfigured in all required devices in datacenter#1
configure the datacenter#1 network as per the following requirements:
l all OSPF devices must exclude the IP prefixes of connected networks when advertising their type 1 router LSA, except for prefixes associated with loopbacks or passive interfaces
l host loopbacks are the only OSPF intra-area prefixes that may appear in any DC devices ‘routing table
l your solution must still apply if any new interface was added to the OSPF domain
l don not use any prefix-list or another explicit filter anywhere
l do not configure any interface as unnumbered
l do not remove any pre-configuration
section 2.3: B2B connection with partner#1
R100 is located in the partner#1 network and is connected to R42. it supports OSPF only. configure the large office network as per the following requirements:
l R42 must run a separate OSPF process with R100
l as mentioned in item 2.6, the site gateways R40 and R41 area not allowed to redistribute OSPF into BGP and vice versa
l R42 is allowed to redistribute OSPF into BGP and vice versa
At the end of the exam:
l The server 2 (that is located in the Datacenter#2) must be able to ping the IP address 100.100.100.100/24 (that is located in the partner#1 network)
R100, the partner router, must receive the external prefixes as shown below and no other prefixes:
Section 3 VPN Technology
Section 3.3: Internet Access
Section 3.4 LAN to LAN IPsec
Section 4 Infrastructure Security
Section 4.1: Device Security
Section 4.2: Network Security
Section 5 Infrastructure Security
Section 5.1: System Management
Section 5.2: Quality of Service
Section 5.3: Network Services
Section 5.4: Network Services
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CCIE Routing and Switching LAB
The CCIE Lab exam is an eight-hour, hands-on exam which requires you to configure and troubleshoot a series of complex networks to given specifications. Knowledge of troubleshooting is an important skill and candidates are expected to diagnose and solve issues as part of the CCIE lab exam.
DIAG: 30 minutes
the act or process of identifying the root cause
TS: The Troubleshooting module is 2 hours. If desired, candidates can extent the Troubleshooting module's time by borrowing up to 30 min from the Configuration module. Note, the total Configuration module time will be reduced by the extra time spend in the Troubleshooting module (if any, up to 30 min). If candidates finish the Troubleshooting module early, the unused Troubleshooting module’s time will be added to the Configuration module’s time, ensuring a total lab exam time of 8 hours.
The Configuration module provides a setup very close to an actual production network having various security components providing various layers of security at different points in the network. Though the major part of the module is based on virtual instances of the Cisco security appliances, the candidate may be asked to work with physical devices as well. At the beginning of the module, the candidate has full visibility of the entire module. A candidate can choose to work in the sequence in which the items are presented or can resolve items in whatever order seems preferable and logical.
NOTE: The candidate must complete the modules in sequence and is not allowed to go back and forth between modules.
1. Layer 2 Technologies 20%
2. Layer 3 Technologies 40%
3. VPN Technologies 20%
4.Infrastructure Security 5%
5.Infrastructure Services 15%