How To Check BGP Memory OF ASR9k

0

Introduction

Refer to some CASE, customer concern why BGP take so many memory resource, and how to optimize BGP, and why memory not release after optimize, and so on. That hard to answer, in order to get answer, we need check more information. From the article, you can simple to know how to check BGP memory, and how to analyzing the BGP memory, those informaiton will help you and customer to do special optimize.

Solution

1. Default scenario, no any BGP route

RP/0/RSP0/CPU0:xxx#show bgp vrf all sum 
Fri Mar 13 11:17:50.267 GMT

VRF: CAP
--------
BGP VRF CAP, state: Active
BGP Route Distinguisher: 132:10042
VRF ID: 0x60000002
BGP router identifier 192.168.1.24, local AS number 132
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000011   RD version: 42
BGP main routing table version 42
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 42/0

BGP is operating in STANDALONE mode.


Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker              42         42         42         42          42          42

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
12.216.156.105    0  1943      74      80       42    0    0 00:35:37          0
12.216.156.237    0  3491      74      80       42    0    0 00:35:34          0
12.216.157.105    0  1944      74      80       42    0    0 00:35:35          0
12.216.158.105    0  1945       0      57        0    0    0 00:00:00 Idle

RP/0/RSP0/CPU0:xxx#show bgp vpnv4 un sum
Fri Mar 13 11:18:02.771 GMT
BGP router identifier 192.168.1.24, local AS number 132
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0   RD version: 0
BGP main routing table version 42
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 42/0
BGP scan interval 60 secs

BGP is operating in STANDALONE mode.


Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker              42         42         42         42          42          42

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
192.168.0.5       0 132.        27      30        0    0    0 00:00:53 Idle

RP/0/RSP0/CPU0:xxx#sh bgp    
Fri Mar 13 11:18:18.105 GMT
RP/0/RSP0/CPU0:xxx#sh bgp vrf CAP 
Fri Mar 13 11:18:22.584 GMT
RP/0/RSP0/CPU0:xxx# 

2. Check bgp memory status by “sh bgp all all pro perfor det

                           Number          Memory Used
Attributes:                0               0               
AS Paths:                  0               0               
Communities:               0               0               
Extended communities:      0               0               
PMSI Tunnel attr:          0               0               
RIBRNH Tunnel attr:        0               0               
PPMP attr:                 0               0               
PE distinguisher labels:   0               0               
Route Reflector Entries:   0               0               
Nexthop Entries:           30              22680           

                      Number          Mem Used      
Remote Prefixes:      0               0             
Remote Paths:         0               0             
Remote Path-elems:    0               0             
Remote RDs:           0               0             

Local Prefixes:       0               0             
Local Paths:          0               0             
Local RDs:            1               80            

Total Prefixes:       0               0             
Total Paths:          0               0             
Total Path-elems:     0               0             
Imported Paths:       0               0             
Total RDs:            1               80            

3. Set up VPNv4 neighbor and sent 3 route from remote PE

RP/0/RSP0/CPU0:xxx#sh bgp vpnv4 un sum
Fri Mar 13 11:28:38.821 GMT
BGP router identifier 192.168.1.24, local AS number 132
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0   RD version: 0
BGP main routing table version 48
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 48/0
BGP scan interval 60 secs

BGP is operating in STANDALONE mode.


Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker              48         48         48         48          48          48

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
192.168.0.5       0 132         33      35       48    0    0 00:00:06          3

RP/0/RSP0/CPU0:xxx#sh bgp
Fri Mar 13 11:28:45.432 GMT
RP/0/RSP0/CPU0:xxx#
RP/0/RSP0/CPU0:xxx#show bgp vpnv4 un
Fri Mar 13 11:28:53.706 GMT
BGP router identifier 192.168.1.24, local AS number 132
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0   RD version: 0
BGP main routing table version 48
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 48/0
BGP scan interval 60 secs

Status codes: s suppressed, d damped, h history, * valid, > best
              i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network            Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 132:10041
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 i
Route Distinguisher: 132:10042 (default for vrf CAP)
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 i
                           Number          Memory Used
Attributes:                1               248             
AS Paths:                  1               486          
Communities:               0               0               
Extended communities:      1               496             
PMSI Tunnel attr:          0               0               
RIBRNH Tunnel attr:        0               0               
PPMP attr:                 0               0               
PE distinguisher labels:   0               0               
Route Reflector Entries:   0               0               
Nexthop Entries:           30              22680   

                      Number          Mem Used      
Remote Prefixes:      3               297           
Remote Paths:         3               192           
Remote Path-elems:    3               156           
Remote RDs:           1               80            

Local Prefixes:       3               297           
Local Paths:          3               192           
Local RDs:            1               80            

Total Prefixes:       6               594   <<< remote+local        
Total Paths:          6               384      
Total Path-elems:     6               384           
Imported Paths:       3               192           
Total RDs:            2               160   

4. Add multi AS-path on 3 bgp route at remote PE

RP/0/RSP0/CPU0:xxx#show bgp vpnv4 un
Fri Mar 13 11:53:07.595 GMT
BGP router identifier 192.168.1.24, local AS number 132
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0   RD version: 0
BGP main routing table version 72
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 72/0
BGP scan interval 60 secs

Status codes: s suppressed, d damped, h history, * valid, > best
              i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network            Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 132:10041
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 100 200 300 400 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 500 600 700 800 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 900 1000 1100 1200 i
Route Distinguisher: 132:10042 (default for vrf CAP)
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 100 200 300 400 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 500 600 700 800 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 900 1000 1100 1200 i
                           Number          Memory Used
Attributes:                3               744             
AS Paths:                  3               1512    <<< if bgp route have diff as-path, will +1 at here. So it is 3.    
Communities:               0               0               
Extended communities:      1               496             
PMSI Tunnel attr:          0               0               
RIBRNH Tunnel attr:        0               0               
PPMP attr:                 0               0               
PE distinguisher labels:   0               0               
Route Reflector Entries:   0               0               
Nexthop Entries:           30              22680           

                      Number          Mem Used      
Remote Prefixes:      3               297           
Remote Paths:         3               192           
Remote Path-elems:    3               156           
Remote RDs:           1               80            

Local Prefixes:       3               297           
Local Paths:          3               192           
Local RDs:            1               80            

Total Prefixes:       6               594           
Total Paths:          6               384           
Total Path-elems:     6               384           
Imported Paths:       3               192           
Total RDs:            2               160     

5. Change follow as-path and check behavior

RP/0/RSP0/CPU0:xxx#sh bgp vpnv4 un 
Fri Mar 13 12:17:46.717 GMT
BGP router identifier 192.168.1.24, local AS number 132
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0   RD version: 0
BGP main routing table version 148
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 148/0
BGP scan interval 60 secs

Status codes: s suppressed, d damped, h history, * valid, > best
              i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network            Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 132:10041
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 100 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 100 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 300 i
Route Distinguisher: 132:10042 (default for vrf CAP)
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 100 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 100 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 300 i
RP/0/RSP0/CPU0:xxx#sh bgp all all process performance-statistics detail 
Fri Mar 13 12:18:35.881 GMT

                           Number          Memory Used
Attributes:                2               496             
AS Paths:                  2               984    <<< two as-path, one is 2003 100, another is 2003 300
Communities:               0               0               
Extended communities:      1               496             
PMSI Tunnel attr:          0               0               
RIBRNH Tunnel attr:        0               0               
PPMP attr:                 0               0               
PE distinguisher labels:   0               0               
Route Reflector Entries:   0               0               
Nexthop Entries:           30              22680           

                      Number          Mem Used      
Remote Prefixes:      3               297           
Remote Paths:         3               192           
Remote Path-elems:    3               156           
Remote RDs:           1               80            

Local Prefixes:       3               297           
Local Paths:          3               192           
Local RDs:            1               80            

Total Prefixes:       6               594           
Total Paths:          6               384           
Total Path-elems:     6               384           
Imported Paths:       3               192           
Total RDs:            2               160     

6. Enable local neighbor and sent 3 BGP route

RP/0/RSP0/CPU0:xxx#sh bgp vrf CAP sum
Fri Mar 13 12:22:30.598 GMT
BGP VRF CAP, state: Active
BGP Route Distinguisher: 132:10042
VRF ID: 0x60000002
BGP router identifier 192.168.1.24, local AS number 132
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000011   RD version: 151
BGP main routing table version 151
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 151/0

BGP is operating in STANDALONE mode.


Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker             151        151        151        151         151         151

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
12.216.156.105    0  1943     203     251      151    0    0 01:40:18          0
12.216.156.237    0  3491     204     251      151    0    0 01:40:15          3
12.216.157.105    0  1944     203     251      151    0    0 01:40:15          0
12.216.158.105    0  1945       0     159        0    0    0 00:00:00 Idle

RP/0/RSP0/CPU0:xxx#sh bgp vrf CAP
Fri Mar 13 12:22:56.730 GMT
BGP VRF CAP, state: Active
BGP Route Distinguisher: 132:10042
VRF ID: 0x60000002
BGP router identifier 192.168.1.24, local AS number 132
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000011   RD version: 151
BGP main routing table version 151
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 151/0

Status codes: s suppressed, d damped, h history, * valid, > best
              i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network            Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 132:10042 (default for vrf CAP)
*> 100.0.0.0/28       12.216.156.237                         0 3491 i
*> 100.0.0.16/28      12.216.156.237                         0 3491 i
*> 100.0.0.32/28      12.216.156.237                         0 3491 i
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 100 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 100 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 300 i 
RP/0/RSP0/CPU0:xxx#sh bgp all all process performance-statistics detail 
Fri Mar 13 12:23:07.331 GMT

                           Number          Memory Used
Attributes:                3               744             
AS Paths:                  3               1470            
Communities:               0               0               
Extended communities:      1               496             
PMSI Tunnel attr:          0               0               
RIBRNH Tunnel attr:        0               0               
PPMP attr:                 0               0               
PE distinguisher labels:   0               0               
Route Reflector Entries:   0               0               
Nexthop Entries:           30              22680           

                      Number          Mem Used      
Remote Prefixes:      3               297           
Remote Paths:         3               192           
Remote Path-elems:    3               156           
Remote RDs:           1               80            

Local Prefixes:       6               594           
Local Paths:          6               384           
Local RDs:            1               80            

Total Prefixes:       9               891           
Total Paths:          9               576           
Total Path-elems:     9               576           
Imported Paths:       3               192           
Total RDs:            2               160  

7. Enable local 2nd neighbor and sent same 3 BGP route

RP/0/RSP0/CPU0:xxx#sh bgp vrf CAP sum                                   
Fri Mar 13 12:25:52.032 GMT
BGP VRF CAP, state: Active
BGP Route Distinguisher: 132:10042
VRF ID: 0x60000002
BGP router identifier 192.168.1.24, local AS number 132
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000011   RD version: 154
BGP main routing table version 154
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 154/0

BGP is operating in STANDALONE mode.


Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker             154        154        154        154         154         154

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
12.216.156.105    0  1943     211     258      154    0    0 01:43:39          3
12.216.156.237    0  3491     211     258      154    0    0 01:43:36          3
12.216.157.105    0  1944     210     258      154    0    0 01:43:37          0
12.216.158.105    0  1945       0     164        0    0    0 00:00:00 Idle

RP/0/RSP0/CPU0:xxx#sh bgp vrf CAP                                       
Fri Mar 13 12:26:07.952 GMT
BGP VRF CAP, state: Active
BGP Route Distinguisher: 132:10042
VRF ID: 0x60000002
BGP router identifier 192.168.1.24, local AS number 132
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000011   RD version: 154
BGP main routing table version 154
BGP NSR Initial initsync version 9 (Reached)
BGP NSR/ISSU Sync-Group versions 154/0

Status codes: s suppressed, d damped, h history, * valid, > best
              i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network            Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 132:10042 (default for vrf CAP)
*> 100.0.0.0/28       12.216.156.105                         0 1943 i
*                     12.216.156.237                         0 3491 i
*> 100.0.0.16/28      12.216.156.105                         0 1943 i
*                     12.216.156.237                         0 3491 i
*> 100.0.0.32/28      12.216.156.105                         0 1943 i
*                     12.216.156.237                         0 3491 i
*>i103.0.0.0/16       192.168.0.5                   100      0 2003 100 i
*>i103.0.32.0/19      192.168.0.5                   100      0 2003 100 i
*>i103.0.48.0/20      192.168.0.5                   100      0 2003 300 i

Processed 6 prefixes, 9 paths        
RP/0/RSP0/CPU0:xxx#sh bgp all all process performance-statistics detail 
Fri Mar 13 12:26:21.961 GMT

                           Number          Memory Used
Attributes:                5               1240  <<<         
AS Paths:                  4               1956            
Communities:               0               0               
Extended communities:      1               496             
PMSI Tunnel attr:          0               0               
RIBRNH Tunnel attr:        0               0               
PPMP attr:                 0               0               
PE distinguisher labels:   0               0               
Route Reflector Entries:   0               0               
Nexthop Entries:           30              22680           

                      Number          Mem Used      
Remote Prefixes:      3               297           
Remote Paths:         3               192           
Remote Path-elems:    3               156           
Remote RDs:           1               80            

Local Prefixes:       6               594           
Local Paths:          9               576           
Local RDs:            1               80            

Multipath Prefixes:   3               297           
Multipath Paths:      6               384           

Total Prefixes:       9               891           
Total Paths:          12              768           
Total Path-elems:     9               768           
Imported Paths:       3               192           
Total RDs:            2               160  

8. Check BGP memory change by follow Table

As follow example, we can check prefix/path had reduced, check by “Mem Used”, but BGP memory didn’t reduce, after checked, all memory hold on chunk, please check by “Top 8”.

9. BGP Chunk not release resource to system

After customer optimize BGP, scales downgrade, but memory not reduce, as above example, that maybe match follow scenario. Follow 1000 byte each trunk only example

– normal scenario:

– abnormal scenario, need to restart BGP/RPFO to release mem resource:

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