cisco 200-125 dumps
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The TAG value is set when the originating ASBR generates an external LSA . If the external LSA is re-advertised to other OSPF autonomous systems, the TAG value is carried by default.
!! no-autoconfig is related to A bit, as defined in RFC2461 . The A bit also becomes an autonomous address configuration flag. When this optional keyword no-autoconfig is configured in CISCO IOS (that is, with the above command), the A bit is set to 0 . If the A bit is set to 1 (the default is 1 ),cisco 200-125 dumps, it indicates that the host on the local link can use this prefix for stateless autoconfiguration.
Routing? The key point is that R2 , through the R2 deployment redistributed routing , routing information may be selected in different transmission routes between the domains.
[Experiment 2 ] Both IPv6 islands use ordinary IPv6 global addresses.
Ipv6 address 2001:45::5/64 router bgp 100
Ipv6 install ipv6 if
Use a hold-down timer to prevent routing loops
Ip prefix-list ABC seq 5 permit 0.0.0.0/0 le 32
First, in order to avoid the suboptimal path problem, we use the distribution list in the in direction on R2 and R3 to filter out 22.214.171.124 .
Complete the construction of the environment and the basic configuration of the device to ensure the interconnection of the entire network.
R2 the original IPv4 header packet replacing IPv6 header, and then transferred to A .
Stateful address autoconfiguration ( DHCPv6 )
AH head, this is very familiar
Becomes 24 bits, appears in HELLO package, DBD package, and router LSA , network LSA , interAreaRouter LSA , Link LSA
OSPFpassive-interface neither sends nor receives routing updates, nor does it send HELLO packets.
Users in the IPv4 single protocol network know that they can access it in the way of 126.96.36.199 .
Redirect message 137
OSPF and RIP
Further, it is found that P is 4188.8.131.52 , the label 301 is allocated . Therefore, when PE1 receives the data packet and goes to 2001:5555::5 , the data packet is pressed into two layers, and the outer label value is 301 , the inner label value is 403 .
R4#show ipv6 route ospf
Neighbor 184.108.40.206 activate
Establish BGP4+ neighbors and deliver IPv6 routes using IPv6 global unicast addresses .
Incoming interface: FastEthernet1/0 RPF nbr: FE80::CE02:1BFF:FE54:0
Neighbor FE80::CE01:8FF:FED8:10 update-source FastEthernet0/0
Ipv6 address 2001:5555::5/128 interface FastEthernet0/0
Local link IPv6 address . . . . . . . . : fe80::200:5efe:1.1 1.1%40
After the above configuration is implemented, R1 will filter out the 3.0 route.
Ip route 0.0.0.0 0.0.0.0 192.168.23.3
R1#show ip cef 220.127.116.11 internal
Origin incomplete, metric 1, localpref 100, valid, internal, best mpls labels in/out nolabel/403
The allocated portion of the entire IPv6 space:
FF02::2 link local range all router multicast addresses
Ipv6 address 2001:12::1/64 Interface loopback0
100x xxxx xxxx xxxx
EIGRP also supports tags .
FF02::1 FF02::2 FF02::5 FF02::6 FF02::1:FF00:2
The configuration of R2 is as follows:
Neighbor 18.104.22.168 send-label redistribute connected redistribute ospf 1
The A record in IPv4 is used to map the host name to a V4 address, and the AAAA resource record maps the host name to an IPv6 address. We can do a test:
// There are routes in the routing table of R3 : 22.214.171.124 , 126.96.36.199 , 192.168.12.0
EIGRP also supports tags .
As a result, on R2 , the OSPF route 188.8.131.52 in the routing table and the 192.168.12.0 directly connected network segment that is declared into the OSPF process are all announced to RIP , and R1 can learn the two routes through RIP. , as shown in the red bold part below.
Look further at this route:
RouterLifetime sends the prefix associated with the RA to
Anycast address has no special address space, and uses a unicast address space. An IPv6 address is assigned to multiple interfaces, only for routers, and packets destined for anycast address are routed to the nearest one assigned to anycast address (determined by the routing protocol). Suitable for communication in One-to-One-of-Many ( one of a pair ) . The receiver only needs to be one of a set of interfaces. For example, if the mobile user accesses the Internet, it needs to access the nearest receiving station from the user due to the geographical location, so that the mobile user can not be too geographically too much. limits. Anycast address can only be used as the destination IP and cannot be used as a source.