Sample IS-IS Configuration in Cisco IOS-XR, IOS and Nexus OS

Fig.1

 

IOS-XR

Configure Loopback

interface Loopback0
ipv4 address 172.16.2.1 255.255.255.255
ipv6 address fdfe:abcd:ef12:0:172:16:2:1/128
ipv6 enable
Configure P2P IP

interface Gi0/0/0/0
description Connection to IOS Fa0/0
ipv4 address 172.17.0.1 255.255.255.252
ipv4 verify unicast source reachable-via any
ipv4 unreachables disable
ipv6 nd suppress-ra
ipv6 verify unicast source reachable-via any
ipv6 address fdfe:ab12:cd34:a00:1::/127
ipv6 enable
ipv6 unreachables disable
load-interval 30
dampening

interface Gi0/0/0/1
description Connection to NX-OS E1/1
ipv4 address 172.18.0.1 255.255.255.252
ipv4 verify unicast source reachable-via any
ipv4 unreachables disable
ipv6 nd suppress-ra
ipv6 verify unicast source reachable-via any
ipv6 address fdfe:ab12:cd34:a00:2::/127
ipv6 enable
ipv6 unreachables disable
load-interval 30
dampening

Configure IS-IS

router isis ABC
is-type level-2-only
net 49.0000.1720.1600.2001.00
nsf ietf
log adjacency changes
address-family ipv4 unicast
metric-style wide
maximum-paths 8
address-family ipv6 unicast
metric-style wide
maximum-paths 8
interface Loopback0
passive
address-family ipv4 unicast
address-family ipv6 unicast
interface Gi0/0/0/0
point-to-point
address-family ipv4 unicast
address-family ipv6 unicast

interface Gi0/0/0/1
point-to-point
address-family ipv4 unicast
address-family ipv6 unicast

 

IOS

 

Configure Loopback

interface Loopback0
ip address 172.16.2.2 255.255.255.255
no ip redirects
no ip unreachables
no ip proxy-arp
ipv6 address fdfe:abcd:ef12:0:172:16:2:2/128
ipv6 enable
no ipv6 redirects

Configure P2P IP

interface Fa0/0
description Connection to IOS-XR Gi0/0/0/0
dampening
ip address 172.17.0.2 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
 ip router isis ABC
load-interval 30
ipv6 address fdfe:ab12:cd34:a00:1::1/127
ipv6 enable
ipv6 nd ra suppress
no ipv6 redirects
ipv6 router isis ABC

Configure IS-IS

router isis ABC
net 49.0000.1720.1600.2002.00
metric-style wide
set-overload-bit on-startup 20
log-adjacency-changes
nsf ietf
passive-interface default
no passive-interface Fa0/0

address-family ipv6
multi-topology
exit-address-family

 

NX-OS

Configure P2P IP

interface Eth1/1
description Connection to IOS-XR Gi0/0/0/1
no cdp enable
no ip redirects
ip address 172.18.0.2/30
ip verify unicast source reachable-via any rx
ipv6 address fdfe:ab12:cd34:a00:2::1/127
ipv6 verify unicast source reachable-via rx
no ipv6 redirects
ip router isis ABC
ipv6 router isis ABC
isis network point-to-point
no isis passive-interface level-2
no shutdown

router isis ABC
net 49.0000.1720.1600.2003.00
is-type level-2
metric-style transition
set-overload-bit on-startup 20
log-adjacency-changes
address-family ipv4 unicast
address-family ipv6 unicast
multi-topology transition
passive-interface default level-2

VERIFICATION

IOS-XR:

RP/0/RP0/CPU0:IOS-XR#show isis adjacency | i IOS
Wed Dec 23 14:22:14.273 SST
IOS           Gi0/0/0/0       *PtoP*        Up    27   1y07w    Yes Up   Up
NX-OS     Gi0/0/0/1       *PtoP*        Up    27   1y06w    Yes Up   Up

IOS:
IOS#show isis neighbors

Tag ABC:
System Id       Type Interface     IP Address      State Holdtime Circuit Id
IOS-XR        L2   Te0/3/0         172.17.0.2          UP    28       00

NX-OS:

NX-OS# show isis adjacency
IS-IS process: ABC VRF: default
IS-IS adjacency database:
Legend: ‘!’: No AF level connectivity in given topology
System ID       SNPA            Level  State  Hold Time  Interface
IOS-XR        N/A             2      UP     00:00:22   Ethernet1/1