What is QinQ Cisco?
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.
How do I configure QinQ?
To configure the switch, follow these steps:
- Enable QinQ: Edge l(config)#: qinq svlan tag-type 88a8.
- Reboot the box with the configuration saved to transfer into svlan bridge mode.
- Configure S-VLANs and ports connected to the customer network.
- Configure the provider ports leading to the core of the provider network.
Is QinQ a Layer 2?
802.1Q tunneling (aka Q-in-Q) is a technique often used by Metro Ethernet providers as a layer 2 VPN for customers.
What is the EtherType of an IEEE 802.1Q frame?
802.1Q VLAN tagging uses an 0x8100 EtherType value. The payload following includes a 16-bit tag control identifier (TCI) followed by an Ethernet frame beginning with a second (original) EtherType field for consumption by end stations. IEEE 802.1ad extends this tagging with further nested EtherType and TCI pairs.
What is EtherType 0x8100?
0x8100 is standard ethertype for single tagged frames (802.1Q), it can be used(and it is) for QinQ tunneling but you should be careful with other vendors configuration, as defaults vary.
What is the difference between ISL and Dot1Q trunk?
ISL is cisco proprietary and presently it is supported only by few high end switches only. Dot1Q is an IEEE’s open standard, which be used to create trunk connection between switches of different vendors. In ISL the original ethernet frame is not modified, it is encapsulated between an ISL header and an FCS.
What is the difference between 802.1Q and 802.1 ad?
IEEE 802.1Q defines a 12-bit VLAN ID field and can identify only 4096 VLANs. With the growth of networks, this limitation has become more acute. IEEE 802.1ad, as an amendment to IEEE 802.1Q, adds an additional 802.1Q tag (also known as a VLAN tag) to single-tagged 802.1Q packets, expanding VLAN space to 4094 x 4094.
What is S VLAN and C VLAN?
CVLAN—Customer network VLANs, also called inner VLANs, refer to VLANs that a customer uses on the private network. · SVLAN—Service provider network VLANs, also called outer VLANs, refer to VLANs that a service provider uses to transmit VLAN tagged traffic for customers.
What is ethertype frame?
EtherType is a two-octet field in an Ethernet frame. It is used to indicate which protocol is encapsulated in the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed. The same field is also used to indicate the size of some Ethernet frames.
What is 0x8100 ethertype?
What is ethertype used for?
What is the purpose of ethertype?
The purpose for the Ethertype is to provide an identifier whereby the communications software can differentiate between various types of protocols. A different protocol handler is used for different function, and the Ethertype identifies the frame as belonging to one or another protocol family.
What is the difference between access link and trunk link?
The access links are part of only one VLAN and carry traffic to only the end devices connected to that particular VLAN. But a trunk link is used to connect switches to other switches or to routers and can carry traffic from multiple VLANs.
What is 0x8100 EtherType?
Why do runts appear on the Catalyst 3750 switch interface output?
When 802.1Q encapsulation is used on a trunk interface on the Catalyst 3750 Switches, runts can be seen on show interface output because valid 802.1Q encapsulated packets which are 61-64 bytes including the q-tag are counted by the Catalyst 3750 Switch as undersized frames, even though these packets are forwarded correctly.
What do you need to know about Cisco Catalyst 3560 switches?
Knowledge of IEEE 802.1Q trunking Knowledge of the configuration of Catalyst 3560 and Catalyst 6500/6000 series switches with use of command-line interface (CLI) The information in this document is based on these software and hardware versions: Catalyst 3560 switch that runs Cisco IOS Software Release 12.2 (25)SEA
What are the requirements to implement Ethernet trunking?
Two ways in which you can implement Ethernet trunking are: Inter-Switch Link Protocol (ISL)—A Cisco proprietary protocol Ensure that you meet these requirements before you attempt this configuration: Knowledge of IEEE 802.1Q trunking