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Demo1:
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
Demo2:
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
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ccie lab preparation
=========================================================== =============== is always no way to make a lot of money. Sometimes the income of a ! 1. Enable IPV6 routing kinetics ipv6 unicast-routing (allows routers to route ipv6 unicast data) EUI-64 generates a MAC address of 48 bits based on the MAC address. The first 24: FFFE: the last 24 bits. 2. Set the dialed number Sftp is an abbreviation of Secure File Transfer Protocol, a secure file transfer protocol. A secure encryption method can be provided for transferring files. Sftp has almost the same syntax and functionality as ftp. SFTP is part of SSH and is a secure way to transfer files to the Blogger server. In fact, the SSH package already contains a secure file transfer subsystem called SFTP (Secure File Transfer Protocol). SFTP itself does not have a separate daemon. It must be done using the sshd daemon (the port number is 22 by default). The corresponding connection operation, so in a sense, SFTP is not like a server program, but more like a client program. SFTP also uses encrypted transmission of authentication information and transmitted data, so using SFTP is very secure. However,ccie lab preparation, since this transmission method uses encryption/decryption technology, the transmission efficiency is much lower than that of ordinary FTP. If you have higher requirements for network security, you can use SFTP instead of FTP.
ccie lab preparation
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CCIE Routing and Switching LAB Dumps
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: Aug 21,2025
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