Routing

Hi all,

Hi,

what are the tagged routes that you are recieving ? are they OSPF or BGP routes ?

Hi,

Could you please provide these o/p ? Also, which protocol has the 666 tag routes on the juniper router ?

show configuration protocols ospf

show configuration protocols bgp

Best Regards,

Mohamed

show protocols ospf
traceoptions {
file ospf size 1m files 3;
flag event;
flag state;
}
export export-to-ospf;
import no-default-route-ospf;
reference-bandwidth 10k;
area 0.0.0.0 {
interface lo0.0 {
passive;
}
interface xe-0/2/1.0 {
retransmit-interval 8;
hello-interval 2;
dead-interval 8;
authentication {
md5 1 key "<snip>"; ## SECRET-DATA
}
}
interface xe-0/2/2.0 {
retransmit-interval 8;
hello-interval 2;
dead-interval 8;
authentication {
md5 1 key "<snip>"; ## SECRET-DATA
}
}
}
area 0.0.0.1 {
interface ge-0/0/0.0 {
metric 20;
hello-interval 2;
}
}

i left the bgp config behind because i receive the tagged 666 routes from ospf and the now redistributed with ospf so it is a ospf thing

the routes come from OSPF.

Hi,

If the 666 tagged routes are internal ospf, you can not filter them out. As the LSDB needs to be the same on all routers in ospf domain.

If this solves your problem, please mark this post as "Accepted Solution"

Best Regards,

Mohamed

I understand now. the routes come from my blackhole router so my plan is to change the routing protocol to rib between the blackhole router and the juniper and then i can use the export policy.

thanks all!

Hey mlangendoen,

Greetings, If I'm understanding correctly, this should work:

set policy-options policy-statement block-tag-666 term tag666 from protocol ospf
set policy-options policy-statement block-tag-666 term tag666 from tag 666
set policy-options policy-statement block-tag-666 term tag666 then reject

set policy-options policy-statement block-tag-666 term default then accept
set protocols ospf import block-tag-666

If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/

Regards,

Lil Dexx
JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB

Umm no, The EX4300 must receive the tagged 666 routes but not redistribute them.

Hey mlangendoen,

Greetings, When you build a routing policy there are import and export attributes. The easiest way to understand import versus export is to visualize the routing table in the middle; the import on the left; and the export on the right.  When you import routes, they are always routes coming from a neighbor that would be installed into the RT.  When you export routes, these are routes within the RT being announced to a neighbor, and for this, you need an import policy instead of an export. for OSPF it is not recommended as the link state data works better when it is consistent, but it is possible depending on your requirements. 

If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/

Regards,

Lil Dexx
JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB

Hi 

Looks like what you woud like to do is to drop a route learned from OSPF neighbor. 

For example:

R1===R2===R3

If R1 is advertising OSPF routes with tag 111, you need to config import policy on R2 to reject it. 

In this case, you need to use import policy to reject by tag.

labroot@jtac-MX80-r053# show logical-systems r2 policy-options policy-statement import-ospf | display set
set logical-systems r2 policy-options policy-statement import-ospf term reject-tag from tag 111
set logical-systems r2 policy-options policy-statement import-ospf term reject-tag then reject

Export policy for ospf is used to redistribute routes from other protocols(BGP, RIP, ISIS, static....)

Best

Mu

Muzhang,

R1 is sending the 666 tag routes and R2 must have them but not redsitribute them to R3 In my case R3 is a FRR freebsd router that had no option foor filter incoming tagged routes so i hope i can do something with R2.