jncip-EBGP case study clarification ,,,
Dears ,
when i prepare to send NLRI to the FBGP peers , i make aggregate for network 192.168/22 & 10/8 on R5 and inject them in IBGP policy ,,
the question : route 192.168/22 arrive to R1 as BGP with next-hop indirect but 10/8 don`t appear as active because next-hop unusable (!!!!!!! keep in consideration the two routes have the same next-hop 10.0.3.3 R3)
- the same behavior for all EBGP routes 200.200/16 & 201.201/16 they appear active on R1 although the next-hop isn`t existing in the routing table (R1 has single default route from R3 as it`s the nssa area no-summarize )..
i know this problem is solved by static route or generated route but i want to understand WHYYYYYYYYYY all routes arrive R1 as active with next-hop indirect except 10/8!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
root@r1> show route 10/8 extensive hidden
inet.0: 28 destinations, 42 routes (27 active, 0 holddown, 2 hidden)
10.0.0.0/8 (2 entries, 0 announced)
BGP Preference: 170/-101
Next hop type: Unusable
Next-hop reference count: 2
State: <Hidden Int Ext>
Local AS: 65000 Peer AS: 65000
Age: 2:03:52
Task: BGP_65000.10.0.3.3+61654
AS path: (65001) I Aggregator: 65412 10.0.3.5
Localpref: 100
Router ID: 10.0.3.3
root@r1> show route 192.168/22 extensive
inet.0: 28 destinations, 42 routes (27 active, 0 holddown, 2 hidden)
192.168.0.0/22 (2 entries, 1 announced)
TSI:
KRT in-kernel 192.168.0.0/22 -> {indirect(131070)}
Page 0 idx 1 Type 1 val 8a3d2b8
Nexthop: Self
AS path: [65000] I
Aggregator: 65412 10.0.9.6
Communities:
Path 192.168.0.0 from 10.0.3.3 Vector len 4. Val: 1
*BGP Preference: 170/-101
Next hop type: Indirect
Next-hop reference count: 8
Source: 10.0.3.3
Next hop type: Router, Next hop index: 471
Next hop: 10.0.4.13 via em3.13, selected
Protocol next hop: 10.0.9.6
when i prepare to send NLRI to the FBGP peers , i make aggregate for network 192.168/22 & 10/8 on R5 and inject them in IBGP policy ,,
the question : route 192.168/22 arrive to R1 as BGP with next-hop indirect but 10/8 don`t appear as active because next-hop unusable (!!!!!!! keep in consideration the two routes have the same next-hop 10.0.3.3 R3)
- the same behavior for all EBGP routes 200.200/16 & 201.201/16 they appear active on R1 although the next-hop isn`t existing in the routing table (R1 has single default route from R3 as it`s the nssa area no-summarize )..
i know this problem is solved by static route or generated route but i want to understand WHYYYYYYYYYY all routes arrive R1 as active with next-hop indirect except 10/8!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
root@r1> show route 10/8 extensive hidden
inet.0: 28 destinations, 42 routes (27 active, 0 holddown, 2 hidden)
10.0.0.0/8 (2 entries, 0 announced)
BGP Preference: 170/-101
Next hop type: Unusable
Next-hop reference count: 2
State: <Hidden Int Ext>
Local AS: 65000 Peer AS: 65000
Age: 2:03:52
Task: BGP_65000.10.0.3.3+61654
AS path: (65001) I Aggregator: 65412 10.0.3.5
Localpref: 100
Router ID: 10.0.3.3
root@r1> show route 192.168/22 extensive
inet.0: 28 destinations, 42 routes (27 active, 0 holddown, 2 hidden)
192.168.0.0/22 (2 entries, 1 announced)
TSI:
KRT in-kernel 192.168.0.0/22 -> {indirect(131070)}
Page 0 idx 1 Type 1 val 8a3d2b8
Nexthop: Self
AS path: [65000] I
Aggregator: 65412 10.0.9.6
Communities:
Path 192.168.0.0 from 10.0.3.3 Vector len 4. Val: 1
*BGP Preference: 170/-101
Next hop type: Indirect
Next-hop reference count: 8
Source: 10.0.3.3
Next hop type: Router, Next hop index: 471
Next hop: 10.0.4.13 via em3.13, selected
Protocol next hop: 10.0.9.6