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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
A: The main sacrifice is my spare time. I think everyone who needs to prepare for the CCIE lab exam needs to make such sacrifices. Although this is a big sacrifice, I feel that it is better to prepare for it than to gradually study it in stages. That's why I always learn in the winter, because I don't have to do too much work at the time, so I can do other things I like to do. One of the difficulties I encountered was that when I took the first CCIE experiment, I lacked special experimental equipment for me to practice. Of course, where I work at TAC, there are countless routers and switches, but these devices are used as a customer when resolving customer cases, so that they cannot be used for the CCIE lab exam. Perhaps this is also why, when I became a SiS engineer, one of the first plans I decided to reach was to lobby the relevant people to set up a special CCIE lab test for other SiS engineers. The interval used. At that time,ccie lab v5, I thought that although I don't need to take CCIE again in the future, I don't need it for the interval of the CCIE lab exam, but it is helpful for other colleagues who want to get CCIE to achieve their goals. But I can't think of it later I still need it. I am fortunate that all management supports and rewards our team's employees for CCIE status (or multiple CCIE qualifications).
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: Nov 05,2024
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