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
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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: Dec 21,2024
PPP authentication method : Set static hostname mapping Many people’s learning is on the surface, including me, just like a young doctor, the general problem can be solved, but in the face of the incurable disease in a decade, it still has to be an old expert. After listening to the training course and knocking on the experiment, most of the projects are not stressful,ccie mobile lab 2018, but if you want to become an “old expert” like the car chubby, you still have time to look at the TCP/IP volume one, routing volume one volume two. RFC documentation.
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