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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)
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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
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: Apr 23,2024
A(config-if)#ip rip authentication key-chain A R14(config-if)#ppp chap hostname 16300 =========================================================== =============== Configuring and Verifying Support for Dynamic Protocols Cisco ASA Adaptive Security Appliance Features =========================================================== =============== Enabled are: you haven't experienced it in society, or you may have been in a good 2. Circuit Switching : PP P , H DLC, SLIP Apply Link state type routing protocol: 2.AUX port ( auxiliary Management Interface ): can be linked access MODEM remote management , exclusive manner . their analysis and understanding of the problem from the teachers and Permit R14(config-if)#encapsulation ppp Source——————group number The source address in IPV6 must be a unicast address. Show running-config to view the currently active configuration. This configuration file is stored in RAM. IGRP: based on bandwidth, latency, reliability, load, MTU (maximum transmission unit) 2. Switch to bridge the number of segments ( ports ) have the number of collision domains . Ok, no, it’s a good thing~ A segment is all 0, can only be represented by a 0 PPP configuration NetMask: target network subnet mask Formal entrance examination: Extending application awareness to security devices, moving security up Switchport mode trunk Packet: A packet transmitted from the Internet layer to the network access layer, or a packet transmitted from the transport layer UDP to the Internet layer. OSPF hierarchy advantages : Cisco MPF Overview =========================================================== =============== Note: With a TFTP server software (with cisco's TFTPServer or 3CDaemon), when the file is too large, 3Cdaemon will be faster. Enter into slot 0 of the number is 1 Ethernet port 1.TCP ( Transmission Control Protocol ), connection-oriented , with retransmission mechanism , reliable transmission Set static hostname mapping Reload 2. Circuit Switching : PP P , H DLC, SLIP Network Access Layer: A layer in the TCP/IP stack that provides an interface to the physical network. by ccie with a very adoring attitude. The The fourth place of the TR: R19's DM*** IPSEC strategy (I have a XXX!!), quite cute! ! ! TCP a) Unicast unicast Serial1 is down, Line protocol is down Free fragment forwarding , detecting only the first 64 bytes of the frame , judging the integrity of the frame . 1. Address Learning Address learing have been busy experimenting with experiments, but I have not absorbed R14(config)#interface bri 0 By the way, the teacher TR does not TR you, I personally feel that "it is a blessing is not a curse, it is a curse to hide", calmly face it. obstacles and still unswervingly cut. Under Static ipv6 route sometimes test There are three working modes of the switch: 1. Store and forward - the data is stored in the buffer, and the CRC cyclic redundancy check is performed. If the packet has a CRC error, the packet is discarded. 2. The straight-through exchange is read-only. The first 6 bytes are searched for the destination address through the address mapping table and then transmitted to the corresponding port. 3. Fragment Discarding - A solution between the first two to check whether the length of the packet is 64 bytes. If it is small,ccie lab keyboard, if it is large, it will be forwarded.
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