help with eBGP in Packet Tracer

tomislav91 · July 2014

I tried to do eBGP between "yellow" and "green" router. It pings each other.
This is codes. Networks are all in my big network. This is only a part, only a BGP part.

router bgp 65200
 bgp log-neighbor-changes
 no synchronization
 neighbor 213.108.31.13 remote-as 64600
 network 31.47.88.0 mask 255.255.248.0
 network 194.145.56.0 mask 255.255.248.0
 network 62.177.32.0 mask 255.255.224.0
 network 176.97.32.0 mask 255.255.224.0
network 195.242.184.0
!
ip classless
ip route 31.47.88.0 255.255.248.0 Null0 
ip route 194.145.56.0 255.255.248.0 Null0 
ip route 62.177.32.0 255.255.224.0 Null0 
ip route 176.97.32.0 255.255.224.0 Null0 
ip route 195.242.184.0 255.255.255.0 Null0

router bgp 64600
 bgp log-neighbor-changes
 no synchronization
 neighbor 213.108.31.14 remote-as 65200
 neighbor 81.161.114.0 remote-as 65500
 network 5.11.56.0 mask 255.255.248.0
 network 46.229.176.0 mask 255.255.240.0
 network 37.233.96.0 mask 255.255.240.0
 network 78.24.16.0 mask 255.255.248.0
network 213.108.31.0
!
ip classless
ip route 5.11.56.0 255.255.248.0 Null0 
ip route 46.229.176.0 255.255.240.0 Null0 
ip route 37.233.96.0 255.255.240.0 Null0 
ip route 78.24.16.0 255.255.248.0 Null0 
ip route 213.108.31.0 255.255.255.0 Null0

Because of PT don't support iBGP, I must do redistribute BGP-OSPF. But don't have much experience in that. Where I put commands

router ospf 1

 router-id x.x.x.x

 redistribute bgp 65200 metric-type 1 metric 100 subnets
.
.
.

Only in AS65200 or where?

networker050184 · July 2014

I'd suggest rather than trying to piece unsupported features together in a simulator you get some real gear or GNS3 and practice it the right way.

tomislav91 · July 2014

I must do it in PT. I rather do in GNS3, but I must it in PT.

fredrikjj · July 2014

tomislav91 wrote: »

I must do it in PT. I rather do in GNS3, but I must it in PT.

So it's a project for school and now you want us to do it instead of you doing some research. Am I close?

I'd suggest connecting both yellow and black to the lower of the green routers. That should make it a bit easier for you. Then redistribute what that BGP router learns into the internal protocol if packet tracer supports that. Use google to find a cisco configuration guide and then compare what it says to what PT has available.

Use this process to verify that it's working:

1. Check that the BGP sessions are up.
2. Check that the BGP router is learning information from black and yellow.
3. Verify that this information is being redistributed into the internal routing protocol.
4. Do the same verifications in yellow/black.
5. If step 1-4 looks good, use ping to verify reachability.

PS.
Those static routes to null0 are probably going to cause you problems so I would remove those right away and start over without them. Unless they are actual summaries and you know what you are doing and have more specific prefixes in the BGP router's routing tables.

tomislav91 · July 2014

Router#sh ip bgp sum
BGP router identifier 213.108.31.13, local AS number 64600
BGP table version is 18, main routing table version 6
10 network entries using 1320 bytes of memory
10 path entries using 520 bytes of memory
5/5 BGP path/bestpath attribute entries using 920 bytes of memory
2 BGP AS-PATH entries using 48 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory
BGP using 2840 total bytes of memory
BGP activity 10/0 prefixes, 10/0 paths, scan interval 60 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
213.108.31.14   4 65200     120     106        18    0    0 00:41:48         4
81.161.114.0    4 65500       0       0        18    0    0 01:51:46        4

Router21>en
Router21#sh ip bgp sum
BGP router identifier 213.108.31.14, local AS number 65200
BGP table version is 17, main routing table version 6
10 network entries using 1320 bytes of memory
10 path entries using 520 bytes of memory
5/5 BGP path/bestpath attribute entries using 920 bytes of memory
2 BGP AS-PATH entries using 48 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory
BGP using 2840 total bytes of memory
BGP activity 10/0 prefixes, 10/0 paths, scan interval 60 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
213.108.31.13   4 64600     115     109        17    0    0 00:42:31        4

I do according to this https://supportforums.cisco.com/document/71756/redistributing-internal-bgp-routes-ospf redistributing, but PC10 didn't ping PC12, unreachable error and request timed out.

What can be problem?

tomislav91 · July 2014

Down it will shows sh run command and I didn't paste all, only important pieces.
traceroute from PC 10 to PC 12.

PC>tracert 37.233.104.10

Tracing route to 37.233.104.10 over a maximum of 30 hops: 

  1   109 ms    1 ms      29 ms     5.11.56.1
  2   0 ms      46 ms     0 ms      213.108.31.17
  3   *         *         *         Request timed out.
  4   *         *         *         Request timed out.
  5   *         *         *         Request timed out.

That is a router 11, you can see in picture, and there is his conf

Router11>en
Router11#sh run

interface FastEthernet0/0
 ip address 213.108.31.17 255.255.255.248
 duplex auto
 speed auto
 ipv6 address 2001:1B38:13:2::/64 eui-64
 ipv6 enable
 ipv6 ospf 1 area 0
!
interface FastEthernet0/1
 ip address 213.108.31.1 255.255.255.252
 duplex auto
 speed auto
 ipv6 address 2001:1B38:11:1::/64 eui-64
 ipv6 enable
 ipv6 ospf 1 area 0
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 router-id 1.1.1.11
 log-adjacency-changes
 redistribute connected subnets 
 network 213.108.31.16 0.0.0.7 area 0
 network 213.108.31.0 0.0.0.3 area 0
!
ipv6 router ospf 1
 router-id 1.1.1.11
 log-adjacency-changes
!
ip classless
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end

It's OK for me. Don't know why here stops.

Why there stops? It seems that router that need to redistribute it, not working well. If you can see in picture, next hop is BGP router.

Router#sh run
!

interface FastEthernet1/1
 ip address 213.108.31.13 255.255.255.252
 duplex auto
 speed auto
 ipv6 address 2001:4C28:5:1::/64 eui-64
 ipv6 enable

router ospf 1
 router-id 1.1.1.10
 log-adjacency-changes
 redistribute bgp 64600 metric 100 metric-type 1 subnets 
 network 213.108.31.0 0.0.0.3 area 0
 network 213.108.31.4 0.0.0.3 area 0
!
router bgp 64600
 bgp log-neighbor-changes
 bgp redistribute-internal
 no synchronization
 neighbor 213.108.31.14 remote-as 65200
 neighbor 81.161.114.0 remote-as 65500
 network 5.11.56.0 mask 255.255.248.0
 network 46.229.176.0 mask 255.255.240.0
 network 37.233.96.0 mask 255.255.240.0
 network 78.24.16.0 mask 255.255.248.0
 network 213.108.31.0
!
ipv6 router ospf 1
 router-id 1.1.1.10
 log-adjacency-changes
 redistribute connected subnets 
!
ip classless
ip route 5.11.56.0 255.255.248.0 Null0 
ip route 46.229.176.0 255.255.240.0 Null0 
ip route 37.233.96.0 255.255.240.0 Null0 
ip route 78.24.16.0 255.255.248.0 Null0 
ip route 213.108.31.0 255.255.255.0 Null0 
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end

But ping 213.108.31.1, not .2, Why then stops at 213.108.31.17, and not in 213.108.31.1

PC>ping 213.108.31.1

Pinging 213.108.31.1 with 32 bytes of data:

Reply from 213.108.31.1: bytes=32 time=157ms TTL=254
Reply from 213.108.31.1: bytes=32 time=0ms TTL=254
Reply from 213.108.31.1: bytes=32 time=53ms TTL=254
Reply from 213.108.31.1: bytes=32 time=124ms TTL=254

Ping statistics for 213.108.31.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 157ms, Average = 83ms

PC>ping 213.108.31.2

Pinging 213.108.31.2 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

tomislav91 · July 2014

i solve problem.
I just want to ask, Can you tell me, if I have BGP network, do I must in that interfaces configure OSPFv3?(if doing ospf in my networking), or BGP stay standalone?
I ask, because, when I was finish, all PCs ping all PCs, but routers doesn't. Only in their AS.
Must I do OSPFv3 on interfaces where is BGP?

fredrikjj · July 2014

Inside the AS, the routers are reachable through OSPF. Outside the AS, the routers and their links (often called 'transit links') won't be reachable unless you advertise them into BGP.

networker050184 · July 2014

Usually your router links will be IP'ed out of a larger block that is advertised to the internet.

tomislav91 · August 2014

fredrikjj wrote: »

Inside the AS, the routers are reachable through OSPF. Outside the AS, the routers and their links (often called 'transit links') won't be reachable unless you advertise them into BGP.

How to advertuse them into BGP? I did redistribution BGP-OSPF because I can't use iBGP in PT

fredrikjj · August 2014

Are you trolling us dude?

tomislav91 · August 2014

Why?
I just some help.
Does anyone has expierence in PT here?

help with eBGP in Packet Tracer

Comments