the VRRP group is disconnected, the status of the router will not change, or the Master, in this case, the host routing in this domain still follows this router, but the host in this domain cannot communicate with the outside world due to its disconnection of the uplink. Therefore, the uplink status detection is added to VRRP to solve this problem.Configure a VRRP
VRRP technology is a technology that solves the problem of single point fault in the host configuration single gateway in the network, by configuring multiple routers into a VRRP group, each VRRP group fictitious a virtual router as the gateway of the host in the network. In a VRRP
Principle:Virtual Routing Redundancy Protocol (Virtual Router Redundancy Protocol, abbreviated VRRP) is by The IETF proposes a routing protocol to address a single point of failure in the configuration of static gateways in the LAN, and1998 has introduced the formal RFC2338 protocol standard in the past year . VRRP is widely used in edge networks, and it is desig
The experimental diagram shows:The experimental connection is as follows: R1 F0/00R1 F0/11R2 equivalent to PC1, after turning off the router function, set the F0The/1 interface address is 192.168.1.1/24 and Gateway 192.168.1.254. R3 equivalent to PC2, after turning off the router function, set the F0/0 Interface address is 192.168.2.2/24 and Gateway 192.168.2.254. ESW1 F0/ - -ESW1 F0/ the theESW1 F1/11ESW2 F1/00Experimental Results: When the configuration
Release date:Updated on:
Affected Systems:Cisco Mdms 9000Description:--------------------------------------------------------------------------------Bugtraq id: 63564CVE (CAN) ID: CVE-2013-5566
Cisco NX-OS is a data center-Level Operating System.
The Cisco MDS 9000 NX-OS software does not properly process VRRP frames, and there is a remote denial of service vu
owner in the VRRP group; the IP address owner automatically has the highest priority: 255. Priority 0 is typically used when the IP address owner actively abandons the master role. The configurable priority range is 1-254. For the same priority of the candidate routers, according to the IP address size order election?VRRP also provides a priority preemption policy, and if configured, a high-priority backup
Networking and configuration steps1.1typical vrrp applications2.8.1 application descriptionTo improve the availability and reliability of your network, you can deploy two SOHO routers for you and use VRRP features of the VRP platform to ensure the robustness of the network. Based on the customer's actual situation, there can be different SOHO router combinations
device will be the same device, another device to do backup, completely do not run data. Not really, experienced engineers will make these devices work, that is, choose one of the devices as part of the VLAN VRRP master, other devices as the remaining VLAN of the VRRP master. This will not allow one of the devices to load very high, while the other device is in a state of inactivity.
Don't talk much, let's
interface GigabitEthernet0/24/60 reduced 60
#Interface Vlanif60Description Link_to_S8508-1-G9/1/12Ip address 172.29.252.2 255.255.255.252Ospf authentication-mode md5 1 cipher *********************Ospf network-type p2pOspf timer hello 3Note: The VRRP virtual routing group is set up above)
#Ospf 100Import-route direct introduces direct connection routing in OSPF, similar to the Cisco redistribute command)Ar
Experiment on a PC running FreeBSD and Junos, topology as above:
Virtual IP (VIP) addresses = 10.0.5.253 and 10.0.6.253
R1 is Master's VLAN 520 and R2 is back
R2 is Master's VLAN 530 and R1 is back
MD5 authentication is enabled. For VLAN 520, the key is ' vrrp520 '. For VLAN 530, the key is "vrrp530"
My virtual router configuration, track first
Logical-systems {r1 {interfaces {fxp1 {unit {Vlan-id 13;
Family inet {address 10.0.4.1/24;
} Un
100.1.1.254VRRP 1 Priority 105R3 ConfigurationInterface fastethernet1/0VRRP 1 IP 100.1.1.2543. Test VRRPSince the priority of the R2 is higher than R3, at this point the R2 bit master router, R3 bit backup router.The virtual gateway IP corresponds to a MAC address format of0000.5e 00.01 01OUI VRRP VRRP Group650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/78/A9/wKioL1aA8s2A5zJjAAAVmObhTYE008.png
protected]~ (keystone_admin)]#ipnetnsexec qrouter-25b9d299-ed2a-469f-8246-1d24ac6f0e15bash[[emailprotected]~ (keystone_admin)]# ifconfigha-a7a786c4-4a:flags=4163LimitEach tenant can have up to 255 ha of virtual router, because Vrid has only 8 bits. And every tenant can only have oneAdministrative networkReference linksHttps://wiki.openstack.org/wiki/Neutron/L3_High_Availability_VRRPHttp://www.openstack.cn/p2510.htmlThis article is from the "The-way-to-cloud" blog, make sure to keep this source
VRRPEnsure that only one vro sends packets on behalf of the vro. The host sends data packets to the vro. The router that forwards the data packet is the master router. If the primary router cannot work for some reason at some time, the vro in the backup state will be selected to replace the original primary router. VRRP makes the host in the LAN seem to use only one vro, and maintains the connectivity of the route even if the first hop router fails.
LAN is not changed, and the configuration and access control list of the external network Port WAN needs to be changed .Increase the configuration of the VPDN. Assuming the username is admin, password 123456, the configuration process is as follows:This case is XX Telecom ADSL PPPoE access, need to use a common ADSL modem and a
Cisco configuration instance _ Cisco dual-Egress NAT configuration objective: to simulate the routing function based on the original address policy when a dual-Egress link is available, and access to the external network from different original addresses is realized, in most cases, the vro uses NAT to translate the Int
Basic configurations of Cisco routers and Cisco router configuration commands
En -- enter the privileged mode config t -- enter the global configuration mode wr (OR) -- save the configuration (otherwise, the configuration fails be
CISCO router switch SNMPv2 configuration, cisco Router
Cisco router SNMP Configuration
Snmp-server community CQGASPZW-R RO // ro read-only
Snmp-server trap-source Loopback0 // use the loopbackaddress as the source address of the message sent by the trap.
Snmp-server host 50
Previous page Everyone talked about Cisco Basic Operation command switch, while dragon boat holiday, the Cisco simple switch configuration, and hope you share "Happy Dragon Boat Festival"! Ok, configure the switch, first, you must enter the global configuration mode switch, successfully connect the switch and landing s
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