
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
Return to the upper mode 1. Static State N A T 2 . Dynamic state N A T . 3 . P the AT The basic protocol of IPV6: ICMPv6 Enable I have encountered some problems in the project, but I have really benefited from the systematic understanding, experimentation and several people's discussion and understanding of the experimental results. /64 SLA Site-Level Aggregation Ipv6 address x:x...... anycast (differentiated from unicast) =========================================================== =============== =========================================================== ================== Fix: I think, this is not to let me PASS, then reconfigure and fix it. Tone test PPP identity verification . At the same time, you need to end with [char c] Your value Suppose you want to install the iron gate (ACL) in C. Should you use in or out? The local unicast address of the next-hop link in the IPV6 routing table Configuring and Verifying Layer 3 and Layer 4 Policies =========================================================== ================ A(config)#inte s 1 A CCIE interviewer who has passed the routing and switching,ccie rs lab passing score, security, and data center interview questions for an engineer. This is an interview topic for someone in early June. After-sales position: Senior Network Engineer. The interviewer has tested 3 CCIEs and the interview process lasted more than 2 hours. The impression was very impressive. If you want to work in the network engineer industry, you can take a look.
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: Oct 30,2026
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