BGP attribute-download

[budilasmono]

Hi all,

did you know about bgp attribute-download :

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.2/routing/command/reference/rr32bgp.html#wp2809802

this command "bgp attribute-download" is required to activate the netflow to include the as number information on the netflow.

does the command will reset the BGP peering connection?

Thanks a lot,

Budi L

[Serge Krier]

Hi Budi,

No, this command has not impact on bgp peering sessions.

It will only allow to download BGP attributes (AS info) associated with each CEF prefixes to help populate the netflow cache and export.

Serge.

[budilasmono]

Hi Serge,

is this command will interupting the service / traffic ?

what is the meaning :

"When BGP attribute download is enabled using the bgp attribute-download command, BGP reinstalls all routes whose attributes are not currently in the RIB."

Thanks,

Budi L

[budilasmono]

Hi all,

i just applied the attribute-download command on the CRS and i got the error :

LC/0/0/CPU0::Mar 12 08:12:02 : fib_mgr[164]: %ROUTING-FIB-3-LCL_ATTRIB_MAX_REACHED : Local attribute index database max(65536) reached

what is that mean ?

Thanks,

Budi L

[Vadim Zhovtanyuk]

Hi Budi,

possibly you hit the

CSCtf80648

BGP attribute ID limited to 64K in 3.8.3, routes without attribute ID

fixed in 3.9.2, 4.0.0 and 4.1.0 releases.

If you are running 3.8.3 you may consider to have a SMU activated for this issue.

If you are running 4.0.0 and still getting this message please be aware

that in 4.0.0 BGP increased the max supported
attributes from 2^16 to 2^20 , and the FIB can only handle 2^16
attributes in hardware, thus with your full internet routing table you
were exceeding the attribute index database maximum of 65536.  In 4.0.1,
the FIB index space is increased to 2^18 to increase the attribute space
to 256K.  

I can recommend to open a TAC SR to verify what exactly happen in your case.

wbr

/vadim