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​BGP - iBGP Full Mesh Configuration

Picture



IOS8
router bgp 100
 bgp log-neighbor-changes
 neighbor 100.9.9.9 remote-as 100
 neighbor 100.9.9.9 update-source Loopback0
 neighbor 100.14.14.14 remote-as 100
 neighbor 100.14.14.14 update-source Loopback0



IOS9
router bgp 100
 bgp log-neighbor-changes
 neighbor 100.8.8.8 remote-as 100
 neighbor 100.8.8.8 update-source Loopback0
 neighbor 100.9.15.15 remote-as 15



CSR11
router bgp 100
 bgp log-neighbor-changes
 no bgp default ipv4-unicast
 neighbor 100.13.13.13 remote-as 100
 neighbor 100.13.13.13 update-source Loopback0
 neighbor 100.14.14.14 remote-as 100
 neighbor 100.14.14.14 update-source Loopback0
 !
 address-family ipv4
  neighbor 100.13.13.13 activate
  neighbor 100.14.14.14 activate
 exit-address-family



XR13
router bgp 100
 address-family ipv4 unicast
 !
 neighbor 100.11.11.11
  remote-as 100
  update-source Loopback0
  address-family ipv4 unicast
  !
 !
 neighbor 100.13.15.15
  remote-as 15
  address-family ipv4 unicast
   route-policy PASS in
   route-policy PASS out
  !
 !


CSR14
router bgp 100
 bgp log-neighbor-changes
 no bgp default ipv4-unicast
 neighbor 100.8.8.8 remote-as 100
 neighbor 100.8.8.8 update-source Loopback0
 neighbor 100.11.11.11 remote-as 100
 neighbor 100.11.11.11 update-source Loopback0
 !
 address-family ipv4
  network 100.14.14.14 mask 255.255.255.255
  neighbor 100.8.8.8 activate
  neighbor 100.11.11.11 activate
 exit-address-family




IOS8#show bgp ipv4 unicast summary 
BGP router identifier 100.8.8.8, local AS number 100
BGP table version is 3, main routing table version 3
3 network entries using 432 bytes of memory
3 path entries using 240 bytes of memory
3/1 BGP path/bestpath attribute entries using 456 bytes of memory
1 BGP AS-PATH entries using 24 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
BGP using 1152 total bytes of memory
BGP activity 3/0 prefixes, 3/0 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
100.9.9.9       4          100      30      30        3    0    0 00:21:12        2
100.14.14.14    4          100      82      77        3    0    0 01:02:23        1




IOS8#show bgp ipv4 unicast         
BGP table version is 3, local router ID is 100.8.8.8
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 * i 100.1.15.0/24    100.9.15.15              0    100      0 15 ?
 r>i 100.14.14.14/32  100.14.14.14             0    100      0 i
 * i 100.15.15.15/32  100.9.15.15              0    100      0 15 i




IOS9#show bgp ipv4 unicast summary 
BGP router identifier 100.9.9.9, local AS number 100
BGP table version is 6, main routing table version 6
2 network entries using 288 bytes of memory
2 path entries using 160 bytes of memory
2/2 BGP path/bestpath attribute entries using 304 bytes of memory
1 BGP AS-PATH entries using 24 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
BGP using 776 total bytes of memory
BGP activity 3/1 prefixes, 3/1 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
100.8.8.8       4          100      30      31        6    0    0 00:21:31        0
100.9.15.15     4           15     219     217        6    0    0 03:12:18        2



IOS9#show bgp ipv4 unicast         
BGP table version is 6, local router ID is 100.9.9.9
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  100.1.15.0/24    100.9.15.15              0             0 15 ?
 *>  100.15.15.15/32  100.9.15.15              0             0 15 i




CSR11#show bgp ipv4 unicast summary 
BGP router identifier 100.11.11.11, local AS number 100
BGP table version is 2, main routing table version 2
3 network entries using 744 bytes of memory
3 path entries using 408 bytes of memory
3/1 BGP path/bestpath attribute entries using 840 bytes of memory
1 BGP AS-PATH entries using 24 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
BGP using 2016 total bytes of memory
BGP activity 3/0 prefixes, 3/0 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
100.13.13.13    4          100      61      63        2    0    0 00:56:25        2
100.14.14.14    4          100      73      70        2    0    0 00:58:32        1



CSR11#show bgp ipv4 unicast         
BGP table version is 2, local router ID is 100.11.11.11
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
              t secondary path, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 * i  100.1.15.0/24    100.13.15.15             0    100      0 15 ?
 r>i  100.14.14.14/32  100.14.14.14             0    100      0 i
 * i  100.15.15.15/32  100.13.15.15             0    100      0 15 i




RP/0/0/CPU0:XR13# show bgp ipv4 unicast summary 
Thu Jan  2 04:05:46.057 UTC
BGP router identifier 100.13.13.13, local AS number 100
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000000   RD version: 6
BGP main routing table version 6
BGP NSR Initial initsync version 2 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs

BGP is operating in STANDALONE mode.


Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer
Speaker               6          6          6          6           6           0

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
100.11.11.11      0   100      62      60        6    0    0 00:55:06          0
100.13.15.15      0    15     209     189        6    0    0 03:04:44          2



RP/0/0/CPU0:XR13# show bgp ipv4 unicast         
Thu Jan  2 04:12:20.800 UTC
BGP router identifier 100.13.13.13, local AS number 100
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000000   RD version: 6
BGP main routing table version 6
BGP NSR Initial initsync version 2 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
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
*> 100.1.15.0/24      100.13.15.15             0             0 15 ?
*> 100.15.15.15/32    100.13.15.15             0             0 15 i

Processed 2 prefixes, 2 paths




CSR14#show bgp ipv4 unicast summary 
BGP router identifier 100.14.14.14, local AS number 100
BGP table version is 2, main routing table version 2
1 network entries using 248 bytes of memory
1 path entries using 120 bytes of memory
1/1 BGP path/bestpath attribute entries using 256 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
BGP using 624 total bytes of memory
BGP activity 2/1 prefixes, 3/2 paths, scan interval 60 secs

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
100.8.8.8       4          100      78      83        2    0    0 01:04:33        0
100.11.11.11    4          100      71      74        2    0    0 00:59:17        0




CSR14#show bgp ipv4 unicast 
BGP table version is 2, local router ID is 100.14.14.14
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, 
              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, 
              x best-external, a additional-path, c RIB-compressed, 
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

     Network          Next Hop            Metric LocPrf Weight Path
 *>  100.14.14.14/32  0.0.0.0                  0         32768 i


iBGP peerings by default don't updates beyond their direct peering. So when CSR14 advertises a route via BGP, IOS8 and CSR11, will receive it, however, IOS9 and XR13 won't receive it. Same with CSR15 advertising a route via BGP, IOS9 and XR13 will receiving and they'll propagate it to their direct peerings. 

This can be solved by forming iBGP peerings with CSR14 to IOS9 and XR13, which would be true full mesh. Or IOS8, CSR11 and CSR14 could become route-reflector-clients of XR13 and IOS9. Or vice-versa, CSR14 being a route-reflector to IOS9 and XR13. 

BGP is used in a variety different scenarios, SP, Enterprise, DC. In this set of labs, we'll be focusing on SP where every router will be enabled for BGP. This necessary for non MPLS enabled BGP environments. Since we'll be focusing on both iBGP and eBGP, it will be necessary to understand how BGP operates. 
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  • Home
  • Technology VoD!
    • Cisco >
      • Route & Switch / Enterprise Infrastructure
  • Technology Breakdowns!
    • Route&Switch/Ent. Infra. >
      • L2 Technologies
      • L3 Technologies
      • VPN Technologies
      • Services >
        • IOS - Dynamic NAT
        • HSRP - IPv4 Setup
        • HSRP - Priority and Preemption
    • Service Provider >
      • IGPs (Interior Gateway Protocols)
      • First Hop Redundancy >
        • HSRP (Hot Standby Router Protocol) >
          • HSRP - IOS/IOS XE Setup
          • HSRP - IOS XR Setup
      • BGP (Border Gateway Protocol)
      • Inter AS Multicast (MSDP)
      • Intra-AS MPLS
      • Inter-AS MPLS
    • Security >
      • IOS Firewall
      • ASA Firewall
      • FirePOWER Threat Defense >
        • FTD - FTD NGFW Device Setup and FMC Integration
      • VPNs >
        • PKI
        • Site to Site VPNs
        • Remote Access VPNs >
          • IOS Remote Access
          • ASA Remote Access
    • Data Center >
      • Nexus 9000v >
        • Nexus 9000v - Enabling Features
        • Nexus 9000v - VLANs and Trunks
        • Nexus 9000v - LACP Port Channels
        • Nexus 9000v - vPC (Virtual Port Channel)
        • Nexus 9000v - OSPFv2
        • Nexus 9000v - VXLAN - Ingress Replication Flood and Learn
        • Nexus 9000v - IP Multicast
        • Nexus 9000v - VxLAN - Multicast Flood and Learn
        • Nexus 9000v - VxLAN - BGP EVPN with Multicast
        • Nexus 9000v - VxLAN - BGP EVPN w/Ingress Replication
        • Nexus 9000v - VxLAN - Inter-VxLAN Routing with BGP EVPN
        • Nexus 9000v - VXLAN - External Routing
      • Nexus 7000v
    • Palo Alto