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A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, [1] they are used in several places, for example:
A multicast address is also used by multiple hosts that acquire the multicast address destination by participating in the multicast distribution protocol among the network routers. A packet that is sent to a multicast address is delivered to all interfaces that have joined the corresponding multicast group. IPv6 does not implement broadcast ...
Once a unique link-local address is established, the IPv6 host determines whether the LAN is connected on this link to any router interface that supports IPv6. It does so by sending out an ICMPv6 router solicitation message to the all-routers [44] multicast group with its link-local address as source. If there is no answer after a predetermined ...
The Internet Engineering Task Force (IETF) has reserved the IPv4 address block 169.254.0.0 / 16 (169.254.0.0 – 169.254.255.255) for link-local addressing. [1] The entire range may be used for this purpose, except for the first 256 and last 256 addresses (169.254.0.0 / 24 and 169.254.255.0 / 24), which are reserved for future use and must not be selected by a host using this dynamic ...
ffx0::/16, ffxf::/16: Reserved ffx1::/16: Interface-local Packets with this destination address may not be sent over any network link, but must remain within the current node; this is the multicast equivalent of the unicast loopback address. ffx2::/16: 224.0.0.0/24: Link-local Packets with this destination address may not be routed anywhere ...
Another limitation appears when routers do not respond to probes or when routers have a limit for ICMP responses. [17] In the presence of traffic load balancing , traceroute may indicate a path that does not actually exist; to minimize this problem there is a traceroute modification called Paris-traceroute, [ 18 ] which maintains the flow ...
The address may denote a specific interface address (including a host identifier, such as 10.0.0.1 / 8), or it may be the beginning address of an entire network (using a host identifier of 0, as in 10.0.0.0 / 8 or its equivalent 10 / 8).
R1(config)# ip route 10.0.0.0 255.0.0.0 backupLink 1 254 In the event that two routing protocols are configured with the same administrative distance, the Cisco router will ignore the configured values and instead use the default values.