Limitation on stubnet prefixes

[Andre Cunha]

Thanks Ondrej, that makes sense.  Is there a way to add routes on the fly then, instead of putting them all in the config file? Or any other suggestion on how I could generate 50000 type-1 LSA. 

Regards
Andre


On 26/07/2019, 12:32, "Ondrej Zajicek" <santiago at crfreenet.org> wrote:

    On Fri, Jul 26, 2019 at 10:49:31AM +0200, Andre Cunha wrote:
    > Hello, 
    > 
    > Is there a limit on the number of stubnet prefixes that we can configure?  I have configured 50000 stubnets but my router receives only 1084 routes. 
    
    Hello
    
    Yes, stubnet prefixes are announced as a part of the Router-LSA, with
    12 B per prefix. With 16bit Router-LSA length, the limit is about 5400
    Router-LSA entries (including other entries than just stubnets). But note
    that having such large Router-LSA may cause many problems, including OSPF
    packet fragmentation, so i would generally suggest to not have larger
    Router-LSA than MTU, i.e. not more than ~100 entries.
    
    This length limit is not enforced in BIRD, if you configure more
    stubnets, the Router-LSA with length modulo 64k is generated, which
    may be invalid. I should add some check and warning there.
    
    External routers are announced as separate External-LSAs, so there is no
    such limit for them.
    
    -- 
    Elen sila lumenn' omentielvo
    
    Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
    OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
    "To err is human -- to blame it on a computer is even more so."