Junos OS

hello...I'm trying to advertise a summary route to a BGP peer and here's my config and it doesn't work

}
routing-options {
        aggregate {
        route 10.0.0.0/8;
    }
}

policy-options {
    policy-statement 10-agg {
        from protocol aggregate;
        then accept;

protocols {
    bgp {
        preference 20;
        group ATT {
            export 10-agg;
            peer-as 100;
            local-as 200;
            neighbor 10.3.2.1;

 

 

when i do

oot# run show route advertising-protocol bgp 10.3.2.1                    

inet.0: 14 destinations, 18 routes (13 active, 0 holddown, 1 hidden)
  Prefix                  Nexthop              MED     Lclpref    AS path
* 10.0.0.0/8              Self                                    {100} I

can anyone point out what's the issue with this config? Thanks

 

Hello,

 

What makes you say it does not work ?

It seems like you are advertising the aggregate to your neighbor...

 

In any case, the typical reason for not advertising an aggregate is when you have no contributing routes. To check this, do a 'show route x/y exact extensive" (x/y = 10/8 in your case).

 

Regards,

/david

It looks like it's sending it but i don't see it on the other side router which is a cisco. So i wasn't sure about the config..i tried

re-distributing static routes that those are received on the other side , only  the aggregate has issue

This works

 

static {
    route 10.0.0.0/8 reject;

   }
}

policy-options {
    policy-statement 10-agg {
        from protocol static;
        then accept;

protocols {
    bgp {
        preference 20;
        group ATT {
            export 10-agg;
            peer-as 100;
            local-as 200;
            neighbor 10.3.2.1;

 

 

and this doesn't - any ideas

 

routing-options {
        aggregate {
        route 10.0.0.0/8;
    }
}

policy-options {
    policy-statement 10-agg {
        from protocol aggregate;
        then accept;

protocols {
    bgp {
        preference 20;
        group ATT {
            export 10-agg;
            peer-as 100;
            local-as 200;
            neighbor 10.3.2.1;

 

hiadmin@m7# run show route 10/8 exact extensive

inet.0: 13 destinations, 16 routes (12 active, 0 holddown, 1 hidden)
10.0.0.0/8 (2 entries, 1 announced)
TSI:
KRT in-kernel 10.0.0.0/8 -> {}
OSPF area : 0.0.0.0, LSA ID : 10.0.0.0, LSA type : Extern
        *Static Preference: 5
                Next hop type: Reject
                Next-hop reference count: 5
                State: <Active Int Ext>
                Age: 4:49:31
                Task: RT
                Announcement bits (2): 0-KRT 2-OSPF
                AS path: I
         Aggregate Preference: 130
                Next hop type: Reject
                Next-hop reference count: 5
                State: <Int Ext>
                Inactive reason: Route Preference
                Age: 4:49:31
                Task: Aggregate
                AS path: {100} I (LocalAgg)
                Flags:                  Depth: 0        Active
                AS path list:
                AS path: 100 I Refcount: 1
                AS path: I Refcount: 1
                Contributing Routes (2):
                        10.3.2.0/24 proto Direct
                        10.3.6.0/23 proto BGP

Looks like you have another entry for the 10.0.0.0/8 route that has a lower preference (more preferred) than the aggregate route.

 

Can you try the following config and provide the output of "show route 10/8 exact extensive"?

 

routing-options {
        aggregate {
        route 10.0.0.0/8;
    }
}

policy-options {
    policy-statement 10-agg {
        from protocol aggregate;
        then accept;

   }

}

that's what i have exactly what you said and output is there as well for run show route 10/8 exact extensive

 

routing-options {
        aggregate {
        route 10.0.0.0/8;
    }
}

policy-options {
    policy-statement 10-agg {
        from protocol aggregate;
        then accept;

Can you provide the output of "show ospf route" and "show configuration routing-options"?

rhiadmin@m7# run show configuration routing-options                  
static {
    route 0.0.0.0/0 next-hop 172.19.116.1;
}
aggregate {
    route 10.0.0.0/8;
}

[edit]
rhiadmin@m7# run show ospf route                                     
Topology default Route Table:

Prefix             Path   Route       NH   Metric  NextHop       Nexthop     
                   Type   Type        Type         Interface     addr/label
10.3.6.2           Intra  AS BR       IP        2  ge-0/0/0.0    192.168.100.1
192.168.1.3        Intra  Router      IP        1  ge-0/0/0.0    192.168.100.1
0.0.0.0/0          Ext2   Network     IP      200  ge-0/0/0.0    192.168.100.1
5.5.5.0/24         Ext2   Network     IP       10  ge-0/0/0.0    192.168.100.1
192.168.1.0/24     Intra  Network     IP        2  ge-0/0/0.0    192.168.100.1
192.168.2.0/24     Ext2   Network     IP      200  ge-0/0/0.0    192.168.100.1
192.168.100.0/24   Intra  Network     IP        1  ge-0/0/0.0

You have 1 hidden route in "show route 10/8 exact extensive" could you please display it I think with  "show route 10/8 exact extensive | display hidden " or "show route 10/8 exact extensive hidden" ?

rhiadmin@m7# run show route 10/8 exact extensive hidden               

inet.0: 13 destinations, 15 routes (12 active, 0 holddown, 1 hidden)

__juniper_private1__.inet.0: 8 destinations, 8 routes (5 active, 0 holddown, 3 hidden)

 

rhiadmin@m7# run show route hidden

inet.0: 13 destinations, 15 routes (12 active, 0 holddown, 1 hidden)
+ = Active Route, - = Last Active, * = Both

127.0.0.1/32        [Direct/0] 1d 23:38:41
                    > via lo0.0

 

 

From the "show route 10/8 exact extensive" output you showed, it looks like there was a static route and aggregate route for 10/8.  Can you verify that have run "commit" after making changes?  Also, please post the full "show route 10/8 extensive" output again.

rhiadmin@m7# run show route 10/8 exact extensive

inet.0: 13 destinations, 15 routes (12 active, 0 holddown, 1 hidden)
10.0.0.0/8 (1 entry, 1 announced)
TSI:
KRT in-kernel 10.0.0.0/8 -> {}
OSPF area : 0.0.0.0, LSA ID : 10.0.0.0, LSA type : Extern
Page 0 idx 0 Type 1 val 8c0ecc0
    Nexthop: Self
    AS path: [200] {100} I (LocalAgg)
    Communities:
Path 10.0.0.0 Vector len 4.  Val: 0
        *Aggregate Preference: 130
                Next hop type: Reject
                Next-hop reference count: 4
                State: <Active Int Ext>
                Age: 2d 1:50:51
                Task: Aggregate
                Announcement bits (3): 0-KRT 2-OSPF 5-BGP RT Background
                AS path: {100} I (LocalAgg)
                Flags:                  Depth: 0        Active
                AS path list:
                AS path: 100 I Refcount: 1
                AS path: I Refcount: 1
                Contributing Routes (2):
                        10.3.2.0/24 proto Direct
                        10.3.6.0/23 proto BGP

__juniper_private1__.inet.0: 8 destinations, 8 routes (5 active, 0 holddown, 3 hidden)

10.0.0.0/8 (1 entry, 0 announced)
        *Direct Preference: 0
                Next hop type: Interface
                Next-hop reference count: 1
                Next hop: via fxp1.0, selected
                State: <Active Int>
                Age: 2d 1:50:13
                Task: IF
                AS path: I

 

 

rhiadmin@m7# run show route 10/8 extensive         

inet.0: 13 destinations, 15 routes (12 active, 0 holddown, 1 hidden)
10.0.0.0/8 (1 entry, 1 announced)
TSI:
KRT in-kernel 10.0.0.0/8 -> {}
OSPF area : 0.0.0.0, LSA ID : 10.0.0.0, LSA type : Extern
Page 0 idx 0 Type 1 val 8c0ecc0
    Nexthop: Self
    AS path: [200] {100} I (LocalAgg)
    Communities:
Path 10.0.0.0 Vector len 4.  Val: 0
        *Aggregate Preference: 130
                Next hop type: Reject
                Next-hop reference count: 4
                State: <Active Int Ext>
                Age: 2d 1:51:33
                Task: Aggregate
                Announcement bits (3): 0-KRT 2-OSPF 5-BGP RT Background
                AS path: {100} I (LocalAgg)
                Flags:                  Depth: 0        Active
                AS path list:
                AS path: 100 I Refcount: 1
                AS path: I Refcount: 1
                Contributing Routes (2):
                        10.3.2.0/24 proto Direct
                        10.3.6.0/23 proto BGP

10.3.2.0/24 (1 entry, 1 announced)
TSI:
OSPF area : 0.0.0.0, LSA ID : 10.3.2.0, LSA type : Extern
Aggregated into 10.0.0.0/8
        *Direct Preference: 0
                Next hop type: Interface
                Next-hop reference count: 1
                Next hop: via ge-0/1/0.0, selected
                State: <Active Int>
                Age: 2d 1:49:53
                Task: IF
                Announcement bits (2): 2-OSPF 4-Aggregate
                AS path: I

10.3.2.2/32 (1 entry, 0 announced)
        *Local  Preference: 0
                Next hop type: Local
                Next-hop reference count: 8
                Interface: ge-0/1/0.0
                State: <Active NoReadvrt Int>
                Age: 2d 1:49:59
                Task: IF
                AS path: I

10.3.6.0/23 (1 entry, 1 announced)
TSI:
KRT in-kernel 10.3.6.0/23 -> {10.3.2.1}
OSPF area : 0.0.0.0, LSA ID : 10.3.6.0, LSA type : Extern
Aggregated into 10.0.0.0/8
        *BGP    Preference: 20/-101
                Next hop type: Router, Next hop index: 529
                Next-hop reference count: 6
                Source: 10.3.2.1
                Next hop: 10.3.2.1 via ge-0/1/0.0, selected
                State: <Active Ext>
                Peer AS:   100
                Age: 1d 21:03:07        Metric: 0
                Task: BGP_100_200.10.3.2.1+179
                Announcement bits (3): 0-KRT 2-OSPF 4-Aggregate
                AS path: 100 I
                Accepted
                Localpref: 100
                Router ID: 5.5.5.5

Ok, looks better.  The 10/8 route should be exported with BGP now.  Can you post the following commands:

 

on the m7:

 

show route advertising-protocol bgp 10.3.2.1 detail

 

on your peer (cisco?):

 

show ip bgp neighbors <m7ip> received-routes

 

What might be happening is that when you configure an aggregate route and one of the contributing routes is learned via eBGP (  10.3.6.0/23 in your case), the as-path in the aggregate route shows all the ASes of the contributing routes, called as-set notation.  Is there any as-path filtering on the cisco?  One way to test would be to turn off the as-set summarization:

 

set routing-options aggregate route 10.0.0.0/8 brief as-path origin igp

on cisco side---no as path filetring here..

 

00000r1#sh ip bgp neighbors 10.3.2.2 received-routes

Total number of prefixes 0

 

rhiadmin@m7# run show route advertising-protocol bgp 10.3.2.1

inet.0: 13 destinations, 15 routes (12 active, 0 holddown, 1 hidden)
  Prefix                  Nexthop              MED     Lclpref    AS path
* 10.0.0.0/8              Self                                    {100} I

Can you provide the bgp configuration on both routers?

 

show configuration protocols bgp

 

show running-config | begin router bgp 

fixed.

 

did "set aggragate brief" under routing-options.....thaks for your help

 

one of the contributing route to 10/8 was learned via BGP from cisco, so when juniper sent 10/8 back out it had the AS number of the cisco as well, so cisco rejected it after seeing it's own AS..

Hi,

 

Can I know how you resolve seeing self problem?

 

 

rhiadmin@m7# run show route 10/8 extensive         

inet.0: 13 destinations, 15 routes (12 active, 0 holddown, 1 hidden)
10.0.0.0/8 (1 entry, 1 announced)
TSI:
KRT in-kernel 10.0.0.0/8 -> {}
OSPF area : 0.0.0.0, LSA ID : 10.0.0.0, LSA type : Extern
Page 0 idx 0 Type 1 val 8c0ecc0
    Nexthop: Self
    AS path: [200] {100} I (LocalAgg)

 

look in the as path. As 100 is the remote side..so when this router send this aggragate out with this AS list, the remote route drops this when it sees it's own AS in the as path