qrcoder c# Backbone Bridges MAC-in-MAC in Objective-C

Generator Data Matrix ECC200 in Objective-C Backbone Bridges MAC-in-MAC

Backbone Bridges MAC-in-MAC
Data Matrix ECC200 Creator In Objective-C
Using Barcode printer for iPhone Control to generate, create Data Matrix 2d barcode image in iPhone applications.
Painting Barcode In Objective-C
Using Barcode printer for iPhone Control to generate, create bar code image in iPhone applications.
The simplest way to introduce the concept of backbone bridges is simply to display the format of a frame carried across a network of backbone bridges, as in Figure 139 This figure shows the frame format as defined in Draft 3 of IEEE Project 8021ah, the draft standard for backbone bridges (It should be emphasized that, as of this writing, this standard has not been approved by IEEE, but this format is likely to be very close to the one in the final version of the standard and is very close to what some vendors have actually implemented) What has happened in the transition from the S-tagged frame (Figure 139c) to the I-tagged frame (Figure 139e) is that
Data Matrix ECC200 Maker In Visual C#
Using Barcode printer for .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
Data Matrix 2d Barcode Creator In .NET
Using Barcode maker for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
The S-tag has been removed from the (perhaps tagged) customer frame in Figure 139a or b, so that the original customer s frame is restored A pair of MAC addresses, a new S-tag (called the B-tag for Backbone tag), and an I-tag have been prepended to the customer s frame (Figure 139d and e) The FRC has been recomputed
Draw ECC200 In Visual Studio .NET
Using Barcode encoder for VS .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
ECC200 Printer In VB.NET
Using Barcode printer for .NET Control to generate, create Data Matrix image in .NET framework applications.
The 24-bit I-SID field in the I-tag carries the EVC identifier information that was in the 12-bit VLAN ID field in the S-tag Thus, the number of customers has expanded from 4094 to 16,777,216, which should be adequate for most providers This solves the problem of the number of available EVCs The priority and DEI bits are the same as in the S-tag, and there are 4 bits for future expansion The B-tag is simply an S-tag Its name has changed, but its function relative to the MAC addresses is the same in a backbone bridge as in a provider bridge
ANSI/AIM Code 128 Creator In Objective-C
Using Barcode creation for iPhone Control to generate, create Code 128 image in iPhone applications.
Creating Bar Code In Objective-C
Using Barcode drawer for iPhone Control to generate, create bar code image in iPhone applications.
13
EAN 13 Drawer In Objective-C
Using Barcode maker for iPhone Control to generate, create EAN 13 image in iPhone applications.
Making UCC.EAN - 128 In Objective-C
Using Barcode maker for iPhone Control to generate, create EAN / UCC - 13 image in iPhone applications.
6 (a) Untagged frame
UCC - 12 Encoder In Objective-C
Using Barcode generation for iPhone Control to generate, create GS1 - 12 image in iPhone applications.
Code 39 Generation In Objective-C
Using Barcode creation for iPhone Control to generate, create Code-39 image in iPhone applications.
destination_address source_address
EAN8 Drawer In Objective-C
Using Barcode encoder for iPhone Control to generate, create EAN-8 image in iPhone applications.
Printing Bar Code In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create bar code image in VS .NET applications.
2 Type/ length
Decoding Code39 In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Create EAN 13 In None
Using Barcode generation for Microsoft Word Control to generate, create EAN13 image in Microsoft Word applications.
46-1498 data
Matrix Barcode Generation In .NET
Using Barcode generation for ASP.NET Control to generate, create Matrix Barcode image in ASP.NET applications.
Barcode Maker In C#.NET
Using Barcode drawer for .NET Control to generate, create barcode image in Visual Studio .NET applications.
4 FRC 46-1498 data 4 FRC 46-1498 data 4 FRC 4 FRC 4 FRC
Linear Barcode Encoder In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create 1D Barcode image in Visual Studio .NET applications.
GTIN - 12 Generator In VS .NET
Using Barcode drawer for VS .NET Control to generate, create UCC - 12 image in Visual Studio .NET applications.
(b) VLAN-tagged frame
6 6 2 4 Type/ destination_address source_address C-VLAN tag length 6 6 4
(c) S-tagged frame 6 6 6 I-tag
destination_address source_address S-VLAN tag 6 6
4 2 C-VLAN tag Type/ (optional) length 46-1498 data 46-1498 data
destination_address source_address (d) I-tagged frame 4 B-tag (format is S-tag) (e) B-tagged + I-tagged frame 6 6
destination_address source_address 6 6
2 4 C-VLAN tag Type/ (optional) length 4 2 C-VLAN tag Type/ (optional) length
6 I-tag
destination_address source_address
destination_address source_address
(f) Format of I-tag
Ethertype (to be assigned) 16
Priority 3
D E Reserved I 4 1
Service Instance Identifier (I-SID) 24 bits
Figure 139 I-tag frame format for 8021ah backbone bridges
The I-Component The MAC addresses in the MAC-in-MAC format identify I-components An I-component is equivalent to a VLAN bridge with certain additional functionality It may be implemented as a separate system or, more likely, as an additional chip (or chops) on a line card in a larger bridge Figure 1310 shows a simple backbone network serving four 8021ad provider bridge networks (S-clouds) In Figure 1310, you can see
Four S-clouds, 1A, 1B, 2, and 3 Each S-cloud is attached to up to 4094 EVCs Three provider edge bridges (PEBs), P, Q, and R Each PEB has two I-components The I-components are lettered A through F Two backbone bridges, X and Y Two customer devices, C-S and C-T Only two connections from the S-clouds to the customer devices are shown, both in black These connections carry C-tagged frames (Figure 139a and b) The physical connections between the S-clouds and the I-components are shown with dash-dot lines They carry frames with S-tags (Figure 139c), as do the connections (not shown) among the provider bridges in each S-cloud The (typically) virtual connections between the I-components and the B-component of each provider edge bridge are shown with dashed lines They carry frames with I-tags, but no B-tags (Figure 139d) The physical connections between the various B-components in the backbone network are shown with heavy lines They typically carry both B-tags and I-tags (Figure 139e)
You can see in Figure 1310 that one S-cloud can connect in any fashion to the provider edge bridges it can have a single connection to one PEB or multiple connections
Ethernet Bridging
S-cloud 1B
Icomponent B
B-component Y (Backbone core bridge, or provider bridge)
B-component Q
B-component P
S-cloud 1A
Icomponent A
B-component X (Backbone core bridge, or provider bridge)
Icomponent C
S-cloud 2
Icomponent D
S-cloud 3
Backbone edge bridge P C-T
Backbone edge bridge Q
Icomponent F
Backbone edge bridge R
Figure 1310 8021ah backbone bridge architecture
to two or more PEBs Each I-component, however, serves only one S-cloud, meaning one set of 4094 VLANs, each with a distinct VLAN ID Since the I-component is, for all practical purposes, itself a provider bridge even playing its part in the S-cloud s Spanning Tree Protocols its redundant connections can even connect the two halves of an S-cloud that is split, whether intentionally or by failure This is the case for S-cloud 1, which is split into 1A and 1B Thus, in Figure 1310, I-components A, B, and E all serve (split) S-cloud 1 Each I-component has its own individual MAC address and can recognize certain multicast MAC addresses These are the outer MAC addresses shown in Figure 139e and f The method used by the I-components to acquire each others MAC addresses, and to use them once acquired, can best be illustrated by following a day in the life of a packet :
Copyright © OnBarcode.com . All rights reserved.