birt gs1 128

birt gs1 128

birt gs1 128

birt ean 128

birt gs1 128

birt gs1 128,
birt ean 128,

birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,

birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,

birt ean 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt gs1 128,
birt ean 128,
birt gs1 128,
birt ean 128,
birt gs1 128,

Director Response Protocol is a simple User Datagram Protocol (UDP) used by the DistributedDirector system to gather metrics DistributedDirector sends two queries to the DRP Server Agents in the field, to acquire Border Gateway Protocol (BGP) and Interior Gateway Protocol (IGP) routing table metrics between the distributed servers and clients, to determine client-to-server distances This allows the DistributedDirector to redirect clients to the topologically closest server and to localize traffic Client-to-server link latency metrics using round-trip times DistributedDirector can thus compare link latencies and maximize end-to-end server access performance by sending the user to the server with the lowest trip time Figure 13-3 illustrates the traffic generated by the DRP

NOTE The unspecified address (all zeroes) can never be used, and neither can an address that contains all ones (all Fs in IPv6 notation)

The zeta function can be de ned in terms of the gamma function via the following relationship:

DistributedDirector selects the best server not only during the end user's initial access, but also for each additional request during the session So, during a typical session, the end user's traffic may be redirected to one or several servers This section defines the various types of metrics that can be configured on the DistributedDirector (as summarized in Table 13-1) These metrics can all be collected, weighed, and/or ordered to define the "best" server for the client Table 13-1: DistributedDirector Metrics

IPv6 still uses subnets, but you won t find a place to type in 255s anywhere IPv6 uses the /X Classless Inter-Domain Routing (CIDR) nomenclature Here s how to write an IP address and subnet for a typical IPv6 host:

(z) =

Measures distance from DRP routers to nearest BGP border router toward client Measures distance from DRP routers to associated distributed servers Determines the distributed server with the lower BGP-MED value

FEDC::CF:0:BA98:1234/64

(1120)

DRP-Multi-Exit Discriminator (MED)

The folks who created IPv6 worked hard to make it powerful and easy to use, but you pretty much have to forget all the rules you learned about IPv4 addressing The biggest item to wrap your mind around is that you no longer have a single IP address unless your network isn t connected to a router When a computer running IPv6 first boots up, it gives itself a link-local address Think of a link-local address as IPv6 s equivalent to IPv4 s APIPA address The first 64-bits of a link-local address is always FE80::/64 That means every address always begins with FE80:0000:0000:0000 If your operating system supports IPv6 and IPv6 is enabled, you can see this address Figure 13-1 is a screenshot of Linux s IFCONFIG command, showing the link-local address

Figure 13-1

Agent DRP-Round Trip Times (RTT) Portion RTTs Portion metric values Determines lowest RTT from server to client Assigns Portion metric values to each server; each server receives traffic corresponding to its Portion metric value Selects a random number for each distributed server; best server is the one with the smallest random number assignment Defines a server to have a statistical preference Yes No

Another way to relate the zeta and gamma functions and to de ne a recursion relation for the zeta function is by using z (1 z ) = 21 z z ( z ) cos ( z ) 2 (1121)

Take a close look at the IP address and compare it to the MAC address The last 64 bits of the IPv6 address, collectively called the Extended Unique Identifier, 64-bit (EUI-64), are taken from the MAC address MAC addresses only contain 48 bits, so your system creates the EUI-64 as follows: 1 Remove the dashes from the MAC address and split it in half:

The DRP-External metric defines the number of BGP autonomous system (AS) hops between the DRP server and the AS of the client requesting the Internet service The DRP server having the least number of AS hops between it and the client is selected as the best server and provides the Internet service to the client Figure 13-4 illustrates this metric

When 0 < x < 1 a plot of | ( z ) | shows a series of ridges located at different points along the imaginary axis These ridges are characterized by the fact that they are monotonically decreasing This is illustrated in Fig 114 A plot over a wider range of the real axis is shown in Fig 115, and a contour plot of the zeta function is shown in Fig 116

2 Add FFFE in the middle: