Problem:Server 1 can not get ip address.
Materials:
SW3#show ip dhcp snooping
Switch DHCP snooping is enabled
DHCP snooping is configured on following VLANs:
none
DHCP snooping is operational on following VLANs:
none
Smartlog is configured on following VLANs:
none
Smartlog is operational on following VLANs:
none
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
ACL is the most important : The ACL condition list will have a condition of hiding " reject all " at the end . Look at the picture and see the configuration. Lesson 3: Configuring Cisco ASA Adaptive Security Appliance Advanced Application Inspections Access-list 100 deny ICMP host 10.3.3.1 host 172.16.3.1 RA 64-bit prefix gateway Point out specific neighbors To understanding Rommon3>IP_SUBNET_MASK=255.255.255.0 (mask of the router) R14(config)#interface bri 0 Set set login password when Target : Segmentation: Packets that are passed from the transport layer's TCP to the Internet layer. 7:30 AM to Yintai downstairs Configuring and Verifying Global ACLs This is a relatively high level, suitable for those who can be comprehensive. The real master is to understate CCIE, left to talk about it! It’s hard to hear the words, and the technology is to rely on the hand to make money (laborers), and the management is to rely on the mouth to make money (workers). The laborers are the people, the laborers are the people. The process of people going to the heights and going to success is actually the process of changing from the laborer to the laborer. I think of many IEs who are decades old and still go to the routers, and the nose is sour. Because I don't know, CCIE has become his wing,ccie lab cost 2019, or has become his shackles. The true master should come from technology and beyond technology. Without CCIE, there would be no us today, but forgetting CCIE, maybe we will have more tomorrow. This sentence is not everyone can understand! We all know that CCIE is a certification issued by Cisco, and we are crazy about Iraq, but how many people can explain why CCIE has such value? The success of CCIE is only a small part of Cisco's success, and who can have a clear idea of Cisco's success! For a company's success, technology has never been dominant, and Cisco has a well-known theory that is technology agnostic! For such a company that started with technology, how much courage and courage it takes to get such a theory! And doing so ensures that Cisco's technology is leading step by step! This is a reasonful dialectic! Isn't we not only learning Cisco's technology, but also learning more from it? What's outside of technology is what Cisco really is. If you are a master in this area, then you will adopt this strategy and believe that your salary will double.
Exam Code: CFG: LAB1、LAB1+、LAB2、LAB2+、LAB3
TS: TS1(5 sets)、TS2(3 sets)
DIAG:DIAG 1~DIAG 8(8 sets)
Certification Provider: Cisco
Certification Exam Name:CCIE Routing and Switching Lab
Update Date: Sep 15,2025
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