Provider P allocates a block of address space A to customer, I an ISP. I allocates a /24, call it B, out of that block to one of their customers, C. C later leaves ISP I and gets a wire directly from provider P. I wishes to give C time to renumber. I would expect the world to see the following announcements. A - I announcing a shorter prefix, A B - P announcing a more specific for the /24 allocated to C Is this not what we all expect? Why I ask is we have provider P telling I that they should stop announcing A and instead announce a bunch of prefixes around the /24. randy
On Wed, 16 Oct 1996, Randy Bush wrote:
A - I announcing a shorter prefix, A B - P announcing a more specific for the /24 allocated to C
Is this not what we all expect?
Yes.
Why I ask is we have provider P telling I that they should stop announcing A and instead announce a bunch of prefixes around the /24.
Unless I'm completely whacked, P has a slight misunderstanding... Ed -------- Ed Landa ComStar Communications Corp. elanda@comstar.com 770-333-8779
P is on crack; send them back to school. Tell them to 'webster specific'. -alan
Provider P allocates a block of address space A to customer, I an ISP.
I allocates a /24, call it B, out of that block to one of their customers, C.
C later leaves ISP I and gets a wire directly from provider P.
I wishes to give C time to renumber.
I would expect the world to see the following announcements.
A - I announcing a shorter prefix, A B - P announcing a more specific for the /24 allocated to C
Is this not what we all expect?
Why I ask is we have provider P telling I that they should stop announcing A and instead announce a bunch of prefixes around the /24.
randy
-- Alan Hannan Not Employed Networking, Ltd. email: alan@mindvision.com. phone: 402/488-0238
In message <m0vDhrl-0007zlC@rip.psg.com>, Randy Bush writes:
Provider P allocates a block of address space A to customer, I an ISP.
I allocates a /24, call it B, out of that block to one of their customers, C.
C later leaves ISP I and gets a wire directly from provider P.
I wishes to give C time to renumber.
I would expect the world to see the following announcements.
A - I announcing a shorter prefix, A B - P announcing a more specific for the /24 allocated to C
Is this not what we all expect?
Why I ask is we have provider P telling I that they should stop announcing A and instead announce a bunch of prefixes around the /24.
randy
Let's get the whole picture: before the move: P announces A'/L1 to <the world> B announces A/L2 to P (where L2 > L1) C announces B/24 to B There is no reason for P to announce anything more specific than A'/L1 to the rest of the world unless B is multihomed. If there is no A'/L1 aggregate then never mind. after the move (if B is single homed to P): P announces A'/L1 to <the world> B announces A/L2 to P (where L2 > L1, L2 < 24) C announces B/24 to B There is no need for P to announce anything more specific than A'/L1 if B is not multihomed. If A'/L1 doesn't exist, there is still no reason to announce anything more specific than A/L2. if B is multihomed: P announces A'/L1 to <the world> B announces A/L2 to P (where L2 > L1, L2 < 24) B announces A/L2 to <other provider O> P announces A/L2 to <the world> O announces A/L2 to <the world> C announces B/24 to B P announces B/24 to <the world> The last part is unfortunate. Curtis
participants (4)
-
alan＠mindvision.com -
Curtis Villamizar -
Ed Landa -
randy＠psg.com