Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ > > advocates for a transmit based flow control where the transmitter monitors > the number of unacknowledged LSPs sent on each interface and

Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Tony - From: Tony Li On Behalf Of tony...@tony.li Sent: Tuesday, February 18, 2020 10:16 PM To: Les Ginsberg (ginsberg) Cc: lsr@ietf.org Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed The TX side flow control is purely based on performance on each interface – there are no

[Lsr] Flow Control Discussion for IS-IS Flooding Speed

Two recent drafts advocate for the use of faster LSP flooding speeds in IS-IS: https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ There is strong agreement on two key points: 1)Modern networks require

Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

> The TX side flow control is purely based on performance on each interface – > there are no implementation requirements imposed or implied as regards the > receiver. Then the LSP transmitter is operating without information from the LSP receiver. Additional information from the receiver can

Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Base protocol operation of the Update process tracks the flooding of LSPs/interface and guarantees timer-based retransmission on P2P interfaces until an acknowledgment is received. Using this base protocol mechanism in combination with exponential backoff of the retransmission timer provides flow

Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Tony – There is no such assumption. Transmitter has exact knowledge of how many unacknowledged LSPs have been transmitted on each interface. Using an algorithm functionally equivalent to the example algorithm in the draft, the transmitter slows down when the neighbor is not acknowledging in a

Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Tony – Overall, I think you are making general statements and not providing needed specifics. Maybe it’s obvious to you how a receiver based window would be calculated – but it isn’t obvious to me – so please help me out here with specifics. What inputs do you need on the receive side in order

Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Les, > Overall, I think you are making general statements and not providing needed > specifics. I’m sorry it’s not specific enough for you. I’m not sure that I can help to your satisfaction. > Maybe it’s obvious to you how a receiver based window would be calculated – > but it isn’t