R4#show running-config Building configuration... Current configuration : 1983 bytes ! ! Last configuration change at 10:55:33 UTC Mon May 20 2019 ! version 15.7 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R4 ! boot-start-marker boot-end-marker ! ! ! no aaa new-model ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ip cef ipv6 unicast-routing ipv6 cef ! multilink bundle-name authenticated ! ! ! ! ! license udi pid CISCO2901/K9 sn FCZ182293KC license boot module c2900 technology-package datak9 ! ! ! redundancy ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 172.16.4.1 255.255.255.0 duplex auto speed auto ipv6 address FE80::4 link-local ipv6 address 2001:DB8:CAFE:4::1/64 ! interface GigabitEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 bandwidth 128 ip address 172.16.2.1 255.255.255.252 ipv6 address FE80::4 link-local ipv6 address 2001:DB8:FEED:2::1/64 ! interface Serial0/0/1 bandwidth 128 ip address 172.16.1.1 255.255.255.252 ipv6 address FE80::4 link-local ipv6 address 2001:DB8:FEED:1::1/64 ! ! router bgp 65401 bgp router-id 4.4.4.4 bgp log-neighbor-changes neighbor 172.16.1.2 remote-as 65101 neighbor 172.16.2.2 remote-as 65101 ! address-family ipv4 network 172.16.4.0 mask 255.255.255.0 neighbor 172.16.1.2 activate neighbor 172.16.2.2 activate exit-address-family ! address-family ipv6 network 2001:DB8:CAFE:4::/64 neighbor 172.16.1.2 activate neighbor 172.16.1.2 route-map next-hop-ipv6 out neighbor 172.16.2.2 activate exit-address-family ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ! ipv6 ioam timestamp ! ! ! control-plane ! ! vstack ! line con 0 line aux 0 line 2 no activation-character no exec transport preferred none transport output lat pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line vty 0 4 login transport input none ! scheduler allocate 20000 1000 ! end R4#show ip int brief Interface IP-Address OK? Method Status Protocol Embedded-Service-Engine0/0 unassigned YES unset administratively down down GigabitEthernet0/0 172.16.4.1 YES manual up up GigabitEthernet0/1 unassigned YES unset administratively down down Serial0/0/0 172.16.2.1 YES manual up up Serial0/0/1 172.16.1.1 YES manual up up R4#show ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set 172.16.0.0/16 is variably subnetted, 6 subnets, 3 masks C 172.16.1.0/30 is directly connected, Serial0/0/1 L 172.16.1.1/32 is directly connected, Serial0/0/1 C 172.16.2.0/30 is directly connected, Serial0/0/0 L 172.16.2.1/32 is directly connected, Serial0/0/0 C 172.16.4.0/24 is directly connected, GigabitEthernet0/0 L 172.16.4.1/32 is directly connected, GigabitEthernet0/0 R4#show ipv6 int brie Em0/0 [administratively down/down] unassigned GigabitEthernet0/0 [up/up] FE80::4 2001:DB8:CAFE:4::1 GigabitEthernet0/1 [administratively down/down] unassigned Serial0/0/0 [up/up] FE80::4 2001:DB8:FEED:2::1 Serial0/0/1 [up/up] FE80::4 2001:DB8:FEED:1::1 R4#show ipv6 route IPv6 Routing Table - default - 7 entries Codes: C - Connected, L - Local, S - Static, U - Per-user Static route B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP H - NHRP, I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea IS - ISIS summary, D - EIGRP, EX - EIGRP external, NM - NEMO ND - ND Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect RL - RPL, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1 OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 la - LISP alt, lr - LISP site-registrations, ld - LISP dyn-eid lA - LISP away, a - Application C 2001:DB8:CAFE:4::/64 [0/0] via GigabitEthernet0/0, directly connected L 2001:DB8:CAFE:4::1/128 [0/0] via GigabitEthernet0/0, receive C 2001:DB8:FEED:1::/64 [0/0] via Serial0/0/1, directly connected L 2001:DB8:FEED:1::1/128 [0/0] via Serial0/0/1, receive C 2001:DB8:FEED:2::/64 [0/0] via Serial0/0/0, directly connected L 2001:DB8:FEED:2::1/128 [0/0] via Serial0/0/0, receive L FF00::/8 [0/0] via Null0, receive R4#show ip bgp neighbors BGP neighbor is 172.16.1.2, remote AS 65101, external link BGP version 4, remote router ID 0.0.0.0 BGP state = Idle Neighbor sessions: 0 active, is not multisession capable (disabled) Stateful switchover support enabled: NO Do log neighbor state changes (via global configuration) Default minimum time between advertisement runs is 30 seconds For address family: IPv4 Unicast BGP table version 2, neighbor version 1/2 Output queue size : 0 Index 0, Advertise bit 0 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 Used as secondary: 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 For address family: IPv6 Unicast BGP table version 2, neighbor version 1/2 Output queue size : 0 Index 0, Advertise bit 0 Outbound path policy configured Route map for outgoing advertisements is next-hop-ipv6 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 Used as secondary: 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 172.16.1.2 Route to peer address reachability Up: 1; Down: 0 Last notification 00:35:39 Connections established 0; dropped 0 Last reset never External BGP neighbor configured for connected checks (single-hop no-disable-connected-check) Interface associated: (none) (peering address NOT in same link) Transport(tcp) path-mtu-discovery is enabled Graceful-Restart is disabled SSO is disabled No active TCP connection BGP neighbor is 172.16.2.2, remote AS 65101, external link BGP version 4, remote router ID 0.0.0.0 BGP state = Idle Neighbor sessions: 0 active, is not multisession capable (disabled) Stateful switchover support enabled: NO Do log neighbor state changes (via global configuration) Default minimum time between advertisement runs is 30 seconds For address family: IPv4 Unicast BGP table version 2, neighbor version 1/2 Output queue size : 0 Index 0, Advertise bit 0 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 Used as secondary: 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 For address family: IPv6 Unicast BGP table version 2, neighbor version 1/2 Output queue size : 0 Index 0, Advertise bit 0 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 Used as secondary: 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 172.16.2.2 Route to peer address reachability Up: 1; Down: 0 Last notification 00:35:34 Connections established 0; dropped 0 Last reset never External BGP neighbor configured for connected checks (single-hop no-disable-connected-check) Interface associated: (none) (peering address NOT in same link) Transport(tcp) path-mtu-discovery is enabled Graceful-Restart is disabled SSO is disabled No active TCP connection R4#show ip bgp summary BGP router identifier 4.4.4.4, local AS number 65401 BGP table version is 2, main routing table version 2 1 network entries using 144 bytes of memory 1 path entries using 88 bytes of memory 1/1 BGP path/bestpath attribute entries using 160 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 392 total bytes of memory BGP activity 2/0 prefixes, 2/0 paths, scan interval 60 secs Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 172.16.1.2 4 65101 0 0 1 0 0 never Idle 172.16.2.2 4 65101 0 0 1 0 0 never Idle