What is Q-in-Q in networking?
A Q-in-Q VLAN tunnel enables a service provider to segregate the traffic of different customers in their infrastructure, while still giving the customer a full range of VLANs for their internal use by adding a second 802.1Q tag to an already tagged frame.
What is Q-in-Q used for?
Overview. Q-in-Q, also known as 802.1ad, is a protocol commonly used by network service providers (NSPs) to provide more Layer 2 flexibility. Q-in-Q allows multiple VLAN tags to be inserted into a single Ethernet frame.
What is the function of 802.1Q protocol in a VLAN implementation?
Encapsulating IEEE 802.1Q VLAN tags within 802.1Q enables service providers to use a single VLAN to support customers who have multiple VLANs. The IEEE 802.1Q-in-Q VLAN Tag Termination feature on the subinterface level preserves VLAN IDs and keeps traffic in different customer VLANs segregated.
What is VLAN tunneling?
802.1Q tunneling enables service providers to use a single VLAN to support customers who have multiple VLANs, while preserving customer VLAN IDs and keeping traffic in different customer VLANs segregated. A port configured to support 802.1Q tunneling is called a tunnel port.
What is ISL used for?
Cisco Inter-Switch Link (ISL) is a Cisco Systems proprietary protocol that maintains VLAN information in Ethernet frames as traffic flows between switches and routers, or switches and switches.
What is 802.1Q trunking used for?
VLAN Trunking (802.1Q) allows physical network interfaces in a computing environment to be shared, or multi-homed.
What is C tag and S tag?
In this double tagging, the C-Tag (customer tag) is the inner tag set by the customer. The S-Tag is the outer tag next to the MAC address.
How does Cisco ISL work?
How it works? The ISL works by encapsulating a 26 byte header and a 4 byte trailer between an Ethernet frame. The trailer is a Frame Check Sequence (FCS) on the ISL packet to ensure that it is not corrupted. The size of the ISL frame varies from 94 bytes to 1548 bytes.
What is ISL interface?
In the VSX solution topology, an Inter-Switch Link (ISL) is a layer 2 interface between two VSX peer switches. Each VSX switch must be configured with an ISL link connected to its peer VSX switch.
How many networks are possible in a VXLAN?
16 million logical networks
VXLAN is an evolution of efforts to standardize on an overlay encapsulation protocol. Compared to VLAN which provides limited number of layer-2 VLANs (typically using 12-bit VLAN ID), VXLAN increases scalability up to 16 million logical networks (with 24-bit VNID) and allows for layer-2 adjacency across IP networks.
Why VXLAN uses UDP?
VxLAN is a IETF RFC7348 Standard, TCP is a reliable and connection oriented protocol with three way hand shake, hence its little bit slower than UDP due to reliability. UDP on other hand is a non reliable, simpler and connectionless protocol hence it is good to use.
What is QinQ encapsulation?