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eBGP, problem reaching ne...

eBGP, problem reaching network

Created: Jan 10, 2021 13:04:02Latest reply: Jan 11, 2021 02:19:51 371 3 0 0 0
  Rewarded HiCoins： 0 (problem resolved)
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Hi, hopefully you can help me with eBGP and reaching my prefixes.


-I can ping ip pool verlop gateway from internet, but can't ping a host.

-Host can ping gateway but nothing else

-Network has been imported under ipv4-family unicast with exactly the same subnet as logical interface


display ip routing-table "network":

Netaddress: next-hop "gateway address"

Gateway:  next hop 127.0.0.1

Host address: next hop 0.0.0.0


interface Vlanif8

 ip address x.x.x.1 255.255.255.0

#

#

ip pool velop server

 gateway x.x.x.1 255.255.255.0

 section 1 x.x.x.2 x.x.x.10

 dns-server 8.8.8.8 

 lease 0 0 5

#

interface GigabitEthernet0/3/2

 description Transit: Cogent 10Gbps

 undo shutdown

 ipv6 enable

 ip address x.x.x.x 255.255.255.248

 dcn

#

interface LoopBack0

 ipv6 enable

 ip address x.x.x.x 255.255.255.255

#

bgp xxxxxx

 router-id x.x.x.x

 graceful-restart

 group COGENTv4 external

 peer COGENTv4 as-number 174

 peer COGENTv4 connect-interface GigabitEthernet0/3/2

 peer COGENTv4 password cipher xxxxx

 peer x.x.x.x as-number 174

 peer x.x.x.x group COGENTv4

 #

 ipv4-family unicast

  undo synchronization

  default local-preference 50

  network x.x.x.x 255.255.254.0

  network x.x.x.x 255.255.255.0

  network x.x.x.x 255.255.255.255

  maximum load-balancing ebgp 3

  load-balancing as-path-ignore

  peer COGENTv4 enable

  peer COGENTv4 as-path-filter cogent-as-import import

  peer COGENTv4 as-path-filter pf-as-export export

  peer COGENTv4 ip-prefix ipv4-infilter import

  peer COGENTv4 ip-prefix ipv4-outfilter export

  peer COGENTv4 route-policy cogent import

  peer x.x.x.x enable

  peer x.x.x.x group COGENTv4

  #

  

  #

route-policy cogent permit node 10

 if-match as-path-filter cogent-as-import

#

ip ip-prefix ipv4-infilter index 20 deny 10.0.0.0 8

ip ip-prefix ipv4-infilter index 30 deny 100.64.0.0 10

ip ip-prefix ipv4-infilter index 40 deny 127.0.0.0 8

ip ip-prefix ipv4-infilter index 50 deny 169.254.0.0 16

ip ip-prefix ipv4-infilter index 60 deny 172.16.0.0 12

ip ip-prefix ipv4-infilter index 70 deny 192.0.0.0 24

ip ip-prefix ipv4-infilter index 80 deny 192.0.2.0 24

ip ip-prefix ipv4-infilter index 90 deny 192.168.0.0 16

ip ip-prefix ipv4-infilter index 100 deny 198.18.0.0 15

ip ip-prefix ipv4-infilter index 110 deny 198.51.100.0 24

ip ip-prefix ipv4-infilter index 120 deny 203.0.113.0 24

ip ip-prefix ipv4-infilter index 130 deny 224.0.0.0 4

ip ip-prefix ipv4-infilter index 140 deny 240.0.0.0 4

ip ip-prefix ipv4-infilter index 6000 permit 0.0.0.0 0 less-equal 32

#

ip ip-prefix ipv4-outfilter index 10 deny 0.0.0.0 8

ip ip-prefix ipv4-outfilter index 20 deny 10.0.0.0 8

ip ip-prefix ipv4-outfilter index 30 deny 100.64.0.0 10

ip ip-prefix ipv4-outfilter index 40 deny 127.0.0.0 8

ip ip-prefix ipv4-outfilter index 50 deny 169.254.0.0 16

ip ip-prefix ipv4-outfilter index 60 deny 172.16.0.0 12

ip ip-prefix ipv4-outfilter index 70 deny 192.0.0.0 24

ip ip-prefix ipv4-outfilter index 80 deny 192.0.2.0 24

ip ip-prefix ipv4-outfilter index 90 deny 192.168.0.0 16

ip ip-prefix ipv4-outfilter index 100 deny 198.18.0.0 15

ip ip-prefix ipv4-outfilter index 110 deny 198.51.100.0 24

ip ip-prefix ipv4-outfilter index 120 deny 203.0.113.0 24

ip ip-prefix ipv4-outfilter index 130 deny 224.0.0.0 4

ip ip-prefix ipv4-outfilter index 140 deny 240.0.0.0 4

ip ip-prefix ipv4-outfilter index 6000 permit 0.0.0.0 0 less-equal 24

ip as-path-filter cogent-as-import index 10 permit ^174.*

ip as-path-filter pf-as-export index 10 permit ^$

ip as-path-filter pf-as-export index 20 permit ^(3.10841_)+$



eBGPbgp

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(0) (0)
Popeye_Wang
Admin Created Jan 11, 2021 02:19:51

Hi, 

You said 'Network has been imported under ipv4-family unicast with exactly the same subnet as logical interface', but I don't see the related command from the configuration you posted. 

You may add the import-route command. 

Example

# 

bgp xxxxxx

  import-route direct route-policy test

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2#
jason_hu
jason_hu Admin Created Jan 10, 2021 13:07:05

Hello,
We're working on your problem. Please be patient.
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3#
E.DR_91
E.DR_91 MVE Author Created Jan 10, 2021 13:56:35

Hi Dear


Please check below:


  1. Identifying the Symptoms of a Broken Network Connection

                  ping (ip-address|hostname)
show route
(ip-address|hostname)
traceroute (ip-address|hostname)

  1. Isolating the Causes of a Network Problem

show < configuration | interfaces | protocols
| route >

  1. Taking Appropriate Action for Resolving the Network Problem

[edit]
delete
routing options static routedestination-prefix
 commit and-quit
show routedestination-prefix

  1. Evaluating the Solution to Check Whether the Network Problem Is Resolved

show route (ip-address|hostname)
ping (ip-address|hostname)
count 3
traceroute (ip-address|hostname)


To identify the symptoms of a problem on your network,
start at one end of your network and follow the routes to the other
end, entering all or one of the following Junos OS command-line interfaces
(CLI) operational mode commands:

content_copy zoom_out_map
user@host>ping(ip-address| host-name)
user@host>show route(ip-address| host-name)
user@host>traceroute(ip-address| host-name)


To isolate the cause of a particular problem, enter
one or all of the following Junos OS CLI operational mode command:

content_copy zoom_out_map

user@host>show <
configuration | bgp | interfaces | isis | ospf | route >



  • Check the local router’s configuration and edit
    it if appropriate.

  • Troubleshoot the intermediate router.

  • Check the remote host configuration and edit it if appropriate.

  • Troubleshoot routing protocols.

  • Identify additional possible causes.


To resolve the problem in this example, enter the following
Junos OS CLI commands:

content_copy zoom_out_map
[edit]
user@R2#delete routing-options static routedestination-prefix
user@R2#commit and-quit
user@R2#show routedestination-prefix


To evaluate the solution, enter the following Junos
OS CLI commands:

content_copy zoom_out_map
user@host>show route(ip-address  |host-name)
user@host>ping(ip-address  | host-name)
user@host>traceroute(ip-address  | host-name)


Configure
Routing Protocol Process Tracing

  1. Configure Routing Protocol Process Tracing

[edit]
edit routing-options
traceoptions
set filefilenamesizesize filesnumber
 show
commit
run show logfilename

  1. Configure Routing Protocol Tracing for a Specific Routing Protocol

[edit]
edit protocolprotocol-name traceoptions
set
filefilenamesizesize filesnumber
 show
commit
run show logfilename

  1. Monitor Trace File Messages Written in Near-Real Time

monitor startfilename

  1. Stop Trace File Monitoring

monitor stopfilename

Configure BGP-Specific Options

  1. Display Detailed BGP Protocol Information

[edit]
edit protocol
bgp traceoptions
set flag update detail
show
commit
run show logfilename

  1. Display Sent or Received BGP Packets

[edit]
edit protocol
bgp traceoptions
set flag update (send | receive)
show
commit
run show logfilename

  1. Diagnose BGP Session Establishment Problems

[edit]
edit protocol
bgp
set traceoptions flag open detail
show
commit
run show logfilename

Configure IS-IS-Specific Options

  1. Displaying Detailed IS-IS Protocol Information

[edit]
edit protocol
isis traceoptions
set flag hello detail
show
commit
run show logfilename

  1. Displaying Sent or Received IS-IS Protocol Packets

[edit]
edit protocols
isis traceoptions
set flag hello (send | receive)
show
commit
run show logfilename

  1. Analyzing IS-IS Link-State PDUs in Detail

[edit]
edit protocols
isis traceoptions
set flag lsp detail
show
commit
run show logfilename

Configure OSPF-Specific Options

  1. Diagnose OSPF Session Establishment Problems

[edit]
edit protocols
ospf traceoptions
set flag hello detail
show
commit
run show logfilename

  1. Analyze OSPF Link-State Advertisement Packets in Detail

[edit]
edit protocols
ospf traceoptions
set flag lsa update detail
show
commit
run show logfilename


View more
  • x
  • convention：
(0) (0)
4#
Popeye_Wang
Popeye_Wang Admin Created Jan 11, 2021 02:19:51

Hi, 

You said 'Network has been imported under ipv4-family unicast with exactly the same subnet as logical interface', but I don't see the related command from the configuration you posted. 

You may add the import-route command. 

Example

# 

bgp xxxxxx

  import-route direct route-policy test

View more
  • x
  • convention：
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