Which IPv6 address is used as the loopback address?
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IPv6 header contains the following things: Show 1. Version - This field contains the version of the IP used in the packet. It is of 4-bit in IP version 6. 2. Traffic class - This is an 8-bits field determining the packet priority. Priority values subdivide into ranges: traffic where the source provides congestion control and non-congestion control traffic. 3. Flow label - This 20 bits specifies the QoS management. Originally created for giving real-time applications special service, but currently unused. 4. Payload length - This 16 bits determines the payload length in bytes. When cleared to zero, the option is a "Jumbo payload" (hop-by-hop). 5. Next header - This 8-bits field specifies the next encapsulated protocol. The values are compatible with those specified for the IPv4 protocol field. 6. Hop limit - This is an 8-bits field newly introduced in IPv6. It replaces the time to live field of IPv4. 7. Source Address - This 128 bits field determines the logical address of the host that is sending the packet. 8. Destination Address - This 128 bits field determines the logical address of the host that is receiving the packet 8. Differences between IPv4 and IPv6
 This section describes how to configure and use user-defined loopback interfaces on the switch. By default, each switch has eight internal IPv6 loopback interfaces (lo-0 as through lo-7) with IPv6 address ::1/128 configured by default on lo-0. This address (::1/128) is used only for internal traffic transmitted within the switch and is not used in packet headers in egress traffic sent to network devices. Each loopback interface can have multiple IPv6 addresses, all of which must be unique. Routing protocols such as OSPFv3, advertise the configured loopback addresses throughout a network or autonomous system. User-defined IPv6 loopback addresses provide these benefits when a routing protocol is enabled:
Assigning an IPv6 address to a loopback interfaceThe following command enables nondefault IPv6 address configuration on loopback interfaces. Syntax:[no] interface loopback <0-7> ipv6 address
You can configure up to 32 IPv6 addresses (and up to 32 IPv4 addresses) on a loopback interface. To configure an IPv6 address for the loopback interface, enter the ipv6 address When you configure an IPv6 address for a loopback interface, you do not specify a prefix. The default prefix/128 applies automatically. Configuring an IPv6 address on a loopback interface HP Switch(config)# interface loopback 1 HP Switch(lo-1)# IPv6 address 2001:db8::1
Displaying loopback interface configurationsUse show ipv6 to display the list of loopback interfaces configured with nondefault IPv6 addresses. (Loopback interface 0, if configured only with the default ::1/128 IPv6 address, does not appear in this listing.)
What is an IPv6 loopback address?The loopback address, also called localhost, is probably familiar to you. It is an internal address that routes back to the local system. The loopback address in IPv4 is 127.0. 01. In IPv6, the loopback address is 0:0:0:0:0:0:0:1 or ::1.
How many loopback addresses are there in IPv6?By default, each switch has eight internal IPv6 loopback interfaces ( lo-0 as through lo-7 ) with IPv6 address ::1/128 configured by default on lo-0 . This address (::1/128) is used only for internal traffic transmitted within the switch and is not used in packet headers in egress traffic sent to network devices.
Why is 127 called loopback address?No datagram “sent” to a network 127 address should ever appear on any network anywhere. 0 and 127 were the only reserved Class A networks by 1981. 0 was used for pointing to a specific host, so that left 127 for loopback.
What is IP address 127.0 0.1 typically used for?0.1, the IP address of the local computer. This IP address allows the machine to connect to and communicate with itself. Therefore, localhost (127.0. 0.1) is used to establish an IP connection to the same device used by the end-user.
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