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Extra resources for MPLS in the SDN Era: Interoperable Scenarios to Make Networks Scale to New Services

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OpenFlow—Flow-Based Forwarding One fundamental architectural attribute of OpenFlow is its per-flow programmabil‐ ity, offering a fine granularity when it comes to defining flows and their associated actions. This results in a flow-based forwarding model. For decades, the industry has produced a wide variety of both flow-based forwarding and packet-based forwarding solutions. Which model is better? Neither—both are. It really depends on the use case. There are parts of the network where even thinking about flow-based forwarding is out of the question, like in the core and most of the broadband edge functions, because it would not scale and there is no need for it.

This behavior, which you can change by using the as-override config‐ uration command, is further discussed in Chapter 3. Figure 1-6 shows BR4’s loopback route signaling process. info Figure 1-6. Internet eBGP and iBGP route signaling—BR4 loopback BR4’s loopback is single-homed to PE4, so a packet that any device in AS 65001 sends to BR4’s loopback should go via PE4 at some point. There is an additional redundancy level on the left side of Figure 1-6. CE1 prefers to reach BR4 via PE1 (Multi Exit Discriminator [MED] 100 is better than MED 200), but if the CE1-PE1 eBGP session fails, it can still fail-over to PE2.

Route-policy PL-eBGP-65001-IN pass end-policy The syntax is different, but the principles are very similar to Junos. The Add-Path functionality (lines 3 through 4) will be explained later. A remarkable difference between the BGP implementation of Junos and IOS XR is that IOS XR by default blocks the reception and advertisement of routes via eBGP. There are two alternative ways to change this default behavior: • Explicitly configure input and output policies (lines 15 through 16, 21 through 22, and 35 through 47) in order to allow IOS XR to signal eBGP routes.

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