Linda,
Please see inline below. Regards, ShunWan 发件人: Linda Dunbar [mailto:[email protected]] 发送时间: 2013年11月2日 6:49 收件人: [email protected]; Jixiaofeng (Steven); Zhuangshunwan 主题: Questions to draft-ji-i2rs-usecases-ccne-service-00 Xiao Feng and ShunWan, draft-ji-i2rs-usecases-ccne-service-00 provides some interesting use cases for I2RS. For the first case “Controlling Path by RR”, are you proposing interfaces to RR router? Is it correct? What if the request to RR conflict with what RR’s own computation from all other routers? ShunWan： Yes, we’re proposing interfaces to RR router. If have conflict, RR should follow the require from controller. Section 3.1 … To assist network operators in addressing this challenge, we present some I2RS RR use case, introduce a set of I2RS programmatic APIs for RR that allows a network operator to flexibly control routing between the traffic ingresses and egresses within an ISP's network. For the following text (3.1.3): Are you trying to make RR dictate routes within one AS with explicit commands, but not via changing RIB? “RR can compute the routes for every router and install/distribute the routes to corresponding routers” ShunWan：Yes. For example, for a path from Source 1 (S1) to Destination 1 (D1), if the computed path is: S1-A-B-C-D1, then the RR will distribute a route (D1) to C with the nexthop set to D1; a route (D1) to B with the nexthop set to C, and a route (D1) to A with the nexthop set to B, and finally the route (D1) will be distributed to S1 by A. +-------------------+ | APP or Controller | +-------------------+ | [Interface for control ip forward network path] | ---- / \ | RR | \ / /-+-\ / | \ / | \ / +--+-+ \ +--+-+/| | B | +--+-+ Source 1---| A | | +----+ | C |--- Destination 1 \ /+----+ | +----+\ / * +---+----+-------+ * / \+--+-+ | +-+--+/ \ Source 2---| D | +--+-+ | F |--- Destination 2 +----+ | E | +----+ +----+ Figure 2: Route Reflection based Traffic Steering (RRTS) For the second case on PCE, are you suggesting using PCEP to control router’s FIB? Thanks, Linda
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