[c-nsp] static route to null0 not visible (BGP)

[Alex Foster]

Hi Tony,

 

Thanks for this :

 

I fully understand the concept of this - but cant understand how my
existing /24, installed using a static route with admin distance of 254,
appears in the routing table (of both routers) and is advertised to both
peers.  I configured the /23 exactly the same and have included it as
part of my IGP (as per the /24) - but it doesn't behave the same (think
I need the penny to drop here - just not getting it).

 

Router-a#sh ip route static

     83.0.0.0/8 is variably subnetted, 114 subnets, 13 masks

S       83.245.6.0/24 is directly connected, Null0

 

Router-a#sh ip bgp 83.245.6.0 255.255.255.0

BGP routing table entry for 83.245.6.0/24, version 1819

Paths: (2 available, best #2, table Default-IP-Routing-Table)

  Advertised to peer-groups:

     transit-provider

  Advertised to non peer-group peers:

  83.245.6.242

  Local

    83.245.6.242 (metric 2) from 83.245.6.242 (83.245.6.242)

      Origin IGP, metric 0, localpref 100, valid, internal

  Local

    0.0.0.0 from 0.0.0.0 (83.245.6.241)

      Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced,
local,

Best

 

Router-a#sh ip bgp 88.215.60.0 255.255.254.0

BGP routing table entry for 88.215.60.0/23, version 263285

Paths: (1 available, best #1, table Default-IP-Routing-Table)

  Advertised to peer-groups:

     transit-provider

  Local

    83.245.6.242 (metric 2) from 83.245.6.242 (83.245.6.242)

      Origin IGP, metric 0, localpref 100, valid, internal, best

 

Router-b#sh ip route static

     83.0.0.0/8 is variably subnetted, 112 subnets, 13 masks

S       83.245.6.0/24 is directly connected, Null0

     88.0.0.0/8 is variably subnetted, 20 subnets, 8 masks

S       88.215.60.0/23 is directly connected, Null0

 

Router-b#sh ip bgp 83.245.6.0 255.255.255.0

BGP routing table entry for 83.245.6.0/24, version 55

Paths: (2 available, best #2, table Default-IP-Routing-Table)

  Advertised to peer-groups:

     transit-provider

  Advertised to non peer-group peers:

  83.245.6.241

  Local

    83.245.6.241 (metric 2) from 83.245.6.241 (83.245.6.241)

      Origin IGP, metric 0, localpref 100, valid, internal

  Local

    0.0.0.0 from 0.0.0.0 (83.245.6.242)

      Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced,
local,

Best

 

Router-b#sh ip bgp 88.215.60.0 255.255.254.0

BGP routing table entry for 88.215.60.0/23, version 63998

Paths: (1 available, best #1, table Default-IP-Routing-Table)

  Advertised to peer-groups:

     transit-provider

  Advertised to non peer-group peers:

  83.245.6.241

  Local

    0.0.0.0 from 0.0.0.0 (83.245.6.242)

      Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced,

best



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