[j-nsp] M Series BGP path selection
David Gethings
davidg at pipex.net
Wed Oct 6 06:51:42 EDT 2004
Hi All,
Attached is the output of the command 'show route 81.89.128.0/20 extentsive'.
As I understand the BGP path selection path 4 (next hop 146.188.68.233)
should be chosen. However it is not.
Could someone please explain why.
Cheers
Dg
-------------- next part --------------
inet.0: 149862 destinations, 860842 routes (149857 active, 5 holddown, 0 hidden)
Restart Complete
81.89.128.0/20 (6 entries, 1 announced)
TSI:
KRT in-kernel 81.89.128.0/20 -> {indirect(416), indirect(467)}
Standby generator for 0.0.0.0/0
Page 0 idx 1 Type 1 val 1750ff78
Nexthop: Self
Localpref: 100
AS path: 1299 3356 25022 I
Communities: 25346:130
Path 81.89.128.0 from 213.248.100.41 Vector len 4. Val: 1
*BGP Preference: 170/-101
Source: 213.248.100.41
Next hop: 213.248.100.41 via ge-2/1/0.0, selected
Next hop: 213.248.100.105 via ge-3/1/0.0
Protocol next hop: 213.248.100.41 Indirect next hop: 87a8900 416
Protocol next hop: 213.248.100.105 Indirect next hop: 87a89c0 467
State: <Active Ext>
Local AS: 25346 Peer AS: 1299
Age: 5d 12:57:06 Metric2: 0
Task: BGP_1299.213.248.100.41+179
Announcement bits (5): 0-KRT 1-RT 4-Aggregate 5-BGP.0.0.0.0+179 6-Resolve inet.0
AS path: 1299 3356 25022 I
Communities: 25346:130
Localpref: 100
Router ID: 213.248.75.253
Indirect next hops: 2
Protocol next hop: 213.248.100.41 Indirect next hop: 87a8900 416
Indirect path forwarding next hops: 1
Next hop: 213.248.100.41 via ge-2/1/0.0
213.248.100.40/30 Originating RIB: inet.0
Node path count: 1
Forwarding nexthops: 1
Next hop type: Interface
Nexthop: via ge-2/1/0.0
Protocol next hop: 213.248.100.105 Indirect next hop: 87a89c0 467
Indirect path forwarding next hops: 1
Next hop: 213.248.100.105 via ge-3/1/0.0
213.248.100.104/30 Originating RIB: inet.0
Node path count: 1
Forwarding nexthops: 1
Next hop type: Interface
Nexthop: via ge-3/1/0.0
BGP Preference: 170/-101
Source: 213.248.100.105
Next hop: 213.248.100.105 via ge-3/1/0.0, selected
Protocol next hop: 213.248.100.105 Indirect next hop: 87a89c0 467
State: <NotBest Ext>
Inactive reason: Update source
Local AS: 25346 Peer AS: 1299
Age: 5d 12:57:06 Metric2: 0
Task: BGP_1299.213.248.100.105+179
AS path: 1299 3356 25022 I
Communities: 25346:130
Localpref: 100
Router ID: 213.248.75.253
Indirect next hops: 1
Protocol next hop: 213.248.100.105 Indirect next hop: 87a89c0 467
Indirect path forwarding next hops: 1
Next hop: 213.248.100.105 via ge-3/1/0.0
213.248.100.104/30 Originating RIB: inet.0
Node path count: 1
Forwarding nexthops: 1
Next hop type: Interface
Nexthop: via ge-3/1/0.0
BGP Preference: 170/-101
Source: 62.241.161.243
Next hop: 62.241.161.130 via ge-1/1/0.5, selected
Protocol next hop: 62.241.161.243 Indirect next hop: 87a8300 321
State: <NotBest Int Ext>
Inactive reason: Interior > Exterior > Exterior via Interior
Local AS: 25346 Peer AS: 25346
Age: 5d 12:57:08 Metric2: 5
Task: BGP_25346.62.241.161.243+4690
AS path: 1299 3356 25022 I
Communities: 25346:130
Localpref: 100
Router ID: 62.241.161.243
Indirect next hops: 1
Protocol next hop: 62.241.161.243 Metric: 5 Indirect next hop: 87a8300 321
Indirect path forwarding next hops: 1
Next hop: 62.241.161.130 via ge-1/1/0.5
62.241.161.243/32 Originating RIB: inet.0
Metric: 5 Node path count: 1
Forwarding nexthops: 1
Nexthop: 62.241.161.130 via ge-1/1/0.5
BGP Preference: 170/-101
Source: 146.188.68.233
Next hop: 146.188.68.233 via ge-0/2/0.0, selected
Protocol next hop: 146.188.68.233 Indirect next hop: 87a8600 323
State: <Ext>
Inactive reason: Active preferred
Local AS: 25346 Peer AS: 702
Age: 5d 12:56:35 Metric2: 0
Task: BGP_702.146.188.68.233+21065
AS path: 702 3356 25022 I
Communities: 25346:120
Localpref: 100
Router ID: 158.43.234.11
Indirect next hops: 1
Protocol next hop: 146.188.68.233 Indirect next hop: 87a8600 323
Indirect path forwarding next hops: 1
Next hop: 146.188.68.233 via ge-0/2/0.0
146.188.68.232/30 Originating RIB: inet.0
Node path count: 1
Forwarding nexthops: 1
Next hop type: Interface
Nexthop: via ge-0/2/0.0
BGP Preference: 170/-101
Source: 146.188.53.221
Next hop: 146.188.53.221 via ge-3/0/0.0, selected
Protocol next hop: 146.188.53.221 Indirect next hop: 87a8000 382
State: <NotBest Ext>
Inactive reason: Not Best in its group
Local AS: 25346 Peer AS: 702
Age: 5d 12:56:48 Metric2: 0
Task: BGP_702.146.188.53.221+21366
AS path: 702 3356 25022 I
Communities: 25346:120
Localpref: 100
Router ID: 158.43.234.21
Indirect next hops: 1
Protocol next hop: 146.188.53.221 Indirect next hop: 87a8000 382
Indirect path forwarding next hops: 1
Next hop: 146.188.53.221 via ge-3/0/0.0
146.188.53.220/30 Originating RIB: inet.0
Node path count: 1
Forwarding nexthops: 1
Next hop type: Interface
Nexthop: via ge-3/0/0.0
BGP Preference: 170/-101
Source: 62.241.161.252
Next hop: 62.241.161.130 via ge-1/1/0.5, selected
Next hop: 62.241.161.98 via ge-1/2/0.0
Protocol next hop: 62.241.161.252 Indirect next hop: 87a8480 452
State: <NotBest Int Ext>
Inactive reason: Not Best in its group
Local AS: 25346 Peer AS: 25346
Age: 5d 12:56:50 Metric: 0 Metric2: 11
Task: BGP_25346.62.241.161.252+65365
AS path: 702 3356 25022 I
Communities: 25346:120
Localpref: 100
Router ID: 62.241.161.252
Indirect next hops: 1
Protocol next hop: 62.241.161.252 Metric: 11 Indirect next hop: 87a8480 452
Indirect path forwarding next hops: 2
Next hop: 62.241.161.130 via ge-1/1/0.5
Next hop: 62.241.161.98 via ge-1/2/0.0
62.241.161.252/32 Originating RIB: inet.0
Metric: 11 Node path count: 1
Forwarding nexthops: 2
Nexthop: 62.241.161.130 via ge-1/1/0.5
Nexthop: 62.241.161.98 via ge-1/2/0.0
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