This lab example is setting up an iBGP IPv4 Unicast Peering between IOS9, XR13 and CSR14.
IOS9
router bgp 100
bgp log-neighbor-changes
neighbor 100.9.15.15 remote-as 15
neighbor 100.14.14.14 remote-as 100
XR13
router bgp 100
neighbor 100.14.14.14
remote-as 100
update-source Loopback0
address-family ipv4 unicast
CSR14
router bgp 100
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 100.9.9.9 remote-as 100
neighbor 100.9.9.9 update-source Loopback0
!
address-family ipv4
neighbor 100.9.9.9 activate
exit-address-family
IOS9#show bgp ipv4 unicast summary
BGP router identifier 100.9.9.9, local AS number 100
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
100.9.15.15 4 15 32 31 1 0 0 00:24:53 0
100.14.14.14 4 100 738 731 1 0 0 11:02:13 0
IOS9#show bgp ipv4 unicast neighbors
BGP neighbor is 100.14.14.14, remote AS 100, internal link
BGP version 4, remote router ID 100.14.14.14
BGP state = Established, up for 00:06:04
Last read 00:00:00, last write 00:00:42, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Enhanced Refresh Capability: advertised and received
Multisession Capability:
Stateful switchover support enabled: NO for session 1
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 1 1
Keepalives: 8 9
Route Refresh: 0 0
Total: 10 11
Do log neighbor state changes (via global configuration)
Default minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast
Session: 100.14.14.14
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 1, Advertise bit 0
1 update-group member
Slow-peer detection is disabled
Slow-peer split-update-group dynamic is disabled
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 0 0
Prefixes Total: 0 0
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 0
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Total: 0 0
Number of NLRIs in the update sent: max 0, min 0
Last detected as dynamic slow peer: never
Dynamic slow peer recovered: never
Refresh Epoch: 1
Last Sent Refresh Start-of-rib: never
Last Sent Refresh End-of-rib: never
Last Received Refresh Start-of-rib: never
Last Received Refresh End-of-rib: never
Sent Rcvd
Refresh activity: ---- ----
Refresh Start-of-RIB 0 0
Refresh End-of-RIB 0 0
Address tracking is enabled, the RIB does have a route to 100.14.14.14
Connections established 1; dropped 0
Last reset never
Interface associated: (none) (peering address NOT in same link)
Transport(tcp) path-mtu-discovery is enabled
Graceful-Restart is disabled
SSO is disabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255
Local host: 100.9.9.9, Local port: 179
Foreign host: 100.14.14.14, Foreign port: 41409
Connection tableid (VRF): 0
Maximum output segment queue size: 50
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x37EA99):
Timer Starts Wakeups Next
Retrans 10 0 0x0
TimeWait 0 0 0x0
AckHold 10 8 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0
Linger 0 0 0x0
ProcessQ 0 0 0x0
iss: 1641847661 snduna: 1641847894 sndnxt: 1641847894
irs: 1108402127 rcvnxt: 1108402379
sndwnd: 16152 scale: 0 maxrcvwnd: 16384
rcvwnd: 16133 scale: 0 delrcvwnd: 251
SRTT: 737 ms, RTTO: 2506 ms, RTV: 1769 ms, KRTT: 0 ms
minRTT: 7 ms, maxRTT: 1000 ms, ACK hold: 200 ms
uptime: 364979 ms, Sent idletime: 392 ms, Receive idletime: 593 ms
Status Flags: passive open, gen tcbs
Option Flags: nagle, path mtu capable
IP Precedence value : 6
Datagrams (max data segment is 1460 bytes):
Rcvd: 20 (out of order: 0), with data: 11, total data bytes: 251
Sent: 21 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 10, total data bytes: 232
Packets received in fast path: 0, fast processed: 0, slow path: 0
fast lock acquisition failures: 0, slow path: 0
TCP Semaphore 0x11E274EC FREE
CSR14#show bgp ipv4 unicast neighbors 100.9.9.9
BGP neighbor is 100.9.9.9, remote AS 100, internal link
BGP version 4, remote router ID 100.9.9.9
BGP state = Established, up for 00:07:03
Last read 00:00:42, last write 00:00:54, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Enhanced Refresh Capability: advertised and received
Multisession Capability:
Stateful switchover support enabled: NO for session 1
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 1 1
Keepalives: 9 9
Route Refresh: 0 0
Total: 11 11
Do log neighbor state changes (via global configuration)
Default minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast
Session: 100.9.9.9
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 1, Advertise bit 0
1 update-group member
Slow-peer detection is disabled
Slow-peer split-update-group dynamic is disabled
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 0 0
Prefixes Total: 0 0
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 0
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Total: 0 0
Number of NLRIs in the update sent: max 0, min 0
Last detected as dynamic slow peer: never
Dynamic slow peer recovered: never
Refresh Epoch: 1
Last Sent Refresh Start-of-rib: never
Last Sent Refresh End-of-rib: never
Last Received Refresh Start-of-rib: never
Last Received Refresh End-of-rib: never
Sent Rcvd
Refresh activity: ---- ----
Refresh Start-of-RIB 0 0
Refresh End-of-RIB 0 0
Address tracking is enabled, the RIB does have a route to 100.9.9.9
Connections established 1; dropped 0
Last reset never
Interface associated: (none) (peering address NOT in same link)
Transport(tcp) path-mtu-discovery is enabled
Graceful-Restart is disabled
SSO is disabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255
Local host: 100.14.14.14, Local port: 41409
Foreign host: 100.9.9.9, Foreign port: 179
Connection tableid (VRF): 0
Maximum output segment queue size: 50
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x42608E):
Timer Starts Wakeups Next
Retrans 11 0 0x0
TimeWait 0 0 0x0
AckHold 11 7 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 1 0 0x4512B1
DeadWait 0 0 0x0
Linger 0 0 0x0
ProcessQ 0 0 0x0
iss: 1108402127 snduna: 1108402379 sndnxt: 1108402379
irs: 1641847661 rcvnxt: 1641847913
sndwnd: 16133 scale: 0 maxrcvwnd: 16384
rcvwnd: 16133 scale: 0 delrcvwnd: 251
SRTT: 770 ms, RTTO: 2360 ms, RTV: 1590 ms, KRTT: 0 ms
minRTT: 12 ms, maxRTT: 1000 ms, ACK hold: 200 ms
uptime: 423337 ms, Sent idletime: 41923 ms, Receive idletime: 42124 ms
Status Flags: active open
Option Flags: nagle, path mtu capable
IP Precedence value : 6
Datagrams (max data segment is 1460 bytes):
Rcvd: 22 (out of order: 0), with data: 11, total data bytes: 251
Sent: 21 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 11, total data bytes: 251
Packets received in fast path: 0, fast processed: 0, slow path: 0
fast lock acquisition failures: 0, slow path: 0
TCP Semaphore 0x7F8A986F4588 FREE
IOS9
router bgp 100
bgp log-neighbor-changes
neighbor 100.9.15.15 remote-as 15
neighbor 100.14.14.14 remote-as 100
XR13
router bgp 100
neighbor 100.14.14.14
remote-as 100
update-source Loopback0
address-family ipv4 unicast
CSR14
router bgp 100
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 100.9.9.9 remote-as 100
neighbor 100.9.9.9 update-source Loopback0
!
address-family ipv4
neighbor 100.9.9.9 activate
exit-address-family
IOS9#show bgp ipv4 unicast summary
BGP router identifier 100.9.9.9, local AS number 100
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
100.9.15.15 4 15 32 31 1 0 0 00:24:53 0
100.14.14.14 4 100 738 731 1 0 0 11:02:13 0
IOS9#show bgp ipv4 unicast neighbors
BGP neighbor is 100.14.14.14, remote AS 100, internal link
BGP version 4, remote router ID 100.14.14.14
BGP state = Established, up for 00:06:04
Last read 00:00:00, last write 00:00:42, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Enhanced Refresh Capability: advertised and received
Multisession Capability:
Stateful switchover support enabled: NO for session 1
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 1 1
Keepalives: 8 9
Route Refresh: 0 0
Total: 10 11
Do log neighbor state changes (via global configuration)
Default minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast
Session: 100.14.14.14
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 1, Advertise bit 0
1 update-group member
Slow-peer detection is disabled
Slow-peer split-update-group dynamic is disabled
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 0 0
Prefixes Total: 0 0
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 0
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Total: 0 0
Number of NLRIs in the update sent: max 0, min 0
Last detected as dynamic slow peer: never
Dynamic slow peer recovered: never
Refresh Epoch: 1
Last Sent Refresh Start-of-rib: never
Last Sent Refresh End-of-rib: never
Last Received Refresh Start-of-rib: never
Last Received Refresh End-of-rib: never
Sent Rcvd
Refresh activity: ---- ----
Refresh Start-of-RIB 0 0
Refresh End-of-RIB 0 0
Address tracking is enabled, the RIB does have a route to 100.14.14.14
Connections established 1; dropped 0
Last reset never
Interface associated: (none) (peering address NOT in same link)
Transport(tcp) path-mtu-discovery is enabled
Graceful-Restart is disabled
SSO is disabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255
Local host: 100.9.9.9, Local port: 179
Foreign host: 100.14.14.14, Foreign port: 41409
Connection tableid (VRF): 0
Maximum output segment queue size: 50
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x37EA99):
Timer Starts Wakeups Next
Retrans 10 0 0x0
TimeWait 0 0 0x0
AckHold 10 8 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0
Linger 0 0 0x0
ProcessQ 0 0 0x0
iss: 1641847661 snduna: 1641847894 sndnxt: 1641847894
irs: 1108402127 rcvnxt: 1108402379
sndwnd: 16152 scale: 0 maxrcvwnd: 16384
rcvwnd: 16133 scale: 0 delrcvwnd: 251
SRTT: 737 ms, RTTO: 2506 ms, RTV: 1769 ms, KRTT: 0 ms
minRTT: 7 ms, maxRTT: 1000 ms, ACK hold: 200 ms
uptime: 364979 ms, Sent idletime: 392 ms, Receive idletime: 593 ms
Status Flags: passive open, gen tcbs
Option Flags: nagle, path mtu capable
IP Precedence value : 6
Datagrams (max data segment is 1460 bytes):
Rcvd: 20 (out of order: 0), with data: 11, total data bytes: 251
Sent: 21 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 10, total data bytes: 232
Packets received in fast path: 0, fast processed: 0, slow path: 0
fast lock acquisition failures: 0, slow path: 0
TCP Semaphore 0x11E274EC FREE
CSR14#show bgp ipv4 unicast neighbors 100.9.9.9
BGP neighbor is 100.9.9.9, remote AS 100, internal link
BGP version 4, remote router ID 100.9.9.9
BGP state = Established, up for 00:07:03
Last read 00:00:42, last write 00:00:54, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Enhanced Refresh Capability: advertised and received
Multisession Capability:
Stateful switchover support enabled: NO for session 1
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 1 1
Keepalives: 9 9
Route Refresh: 0 0
Total: 11 11
Do log neighbor state changes (via global configuration)
Default minimum time between advertisement runs is 0 seconds
For address family: IPv4 Unicast
Session: 100.9.9.9
BGP table version 1, neighbor version 1/0
Output queue size : 0
Index 1, Advertise bit 0
1 update-group member
Slow-peer detection is disabled
Slow-peer split-update-group dynamic is disabled
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 0 0
Prefixes Total: 0 0
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 0
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Total: 0 0
Number of NLRIs in the update sent: max 0, min 0
Last detected as dynamic slow peer: never
Dynamic slow peer recovered: never
Refresh Epoch: 1
Last Sent Refresh Start-of-rib: never
Last Sent Refresh End-of-rib: never
Last Received Refresh Start-of-rib: never
Last Received Refresh End-of-rib: never
Sent Rcvd
Refresh activity: ---- ----
Refresh Start-of-RIB 0 0
Refresh End-of-RIB 0 0
Address tracking is enabled, the RIB does have a route to 100.9.9.9
Connections established 1; dropped 0
Last reset never
Interface associated: (none) (peering address NOT in same link)
Transport(tcp) path-mtu-discovery is enabled
Graceful-Restart is disabled
SSO is disabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255
Local host: 100.14.14.14, Local port: 41409
Foreign host: 100.9.9.9, Foreign port: 179
Connection tableid (VRF): 0
Maximum output segment queue size: 50
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x42608E):
Timer Starts Wakeups Next
Retrans 11 0 0x0
TimeWait 0 0 0x0
AckHold 11 7 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 1 0 0x4512B1
DeadWait 0 0 0x0
Linger 0 0 0x0
ProcessQ 0 0 0x0
iss: 1108402127 snduna: 1108402379 sndnxt: 1108402379
irs: 1641847661 rcvnxt: 1641847913
sndwnd: 16133 scale: 0 maxrcvwnd: 16384
rcvwnd: 16133 scale: 0 delrcvwnd: 251
SRTT: 770 ms, RTTO: 2360 ms, RTV: 1590 ms, KRTT: 0 ms
minRTT: 12 ms, maxRTT: 1000 ms, ACK hold: 200 ms
uptime: 423337 ms, Sent idletime: 41923 ms, Receive idletime: 42124 ms
Status Flags: active open
Option Flags: nagle, path mtu capable
IP Precedence value : 6
Datagrams (max data segment is 1460 bytes):
Rcvd: 22 (out of order: 0), with data: 11, total data bytes: 251
Sent: 21 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 11, total data bytes: 251
Packets received in fast path: 0, fast processed: 0, slow path: 0
fast lock acquisition failures: 0, slow path: 0
TCP Semaphore 0x7F8A986F4588 FREE
