R4#show running-config
Building configuration...

Current configuration : 1474 bytes
!
! Last configuration change at 10:47:12 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
!
!
!
!
!
!
!

no ip domain lookup
ip cef
no ipv6 cef
multilink bundle-name authenticated
!
!
!
!
license udi pid CISCO1921/K9 sn FCZ2118401L
license boot module c1900 technology-package datak9
!
!
!
redundancy
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
 no ip address
 shutdown
!
interface GigabitEthernet0/0
 ip address 176.16.4.1 255.255.255.0
 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
 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
 ip address 172.16.1.1 255.255.255.252
 ipv6 address FE80::4 link-local
 ipv6 address 2001:DB8:FEED:1::1/64
!
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
!
ipv6 ioam timestamp
!
!
!
control-plane
!
!
 vstack
!
line con 0
 logging synchronous
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                Prot
ocol
Embedded-Service-Engine0/0 unassigned      YES unset  administratively down down

GigabitEthernet0/0         176.16.4.1      YES manual down                  down

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#
4#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, 4 subnets, 2 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
R4#
4#show ipv6 int brief
Em0/0                  [administratively down/down]
    unassigned
GigabitEthernet0/0     [down/down]
    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#

R4#show ipv6 route
IPv6 Routing Table - default - 5 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
       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: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#