Table Of Contents

Configuring IPv6

Supported IPv6 Features

IPv6 Limitations

Supported IPv6 Commands

Sample IPv6 Configurations

Configuring IPv6

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The Cisco MWR 2941 routr provides support for a subset of the IPv6 features supported in Cisco IOS Release 15.1(1)S. The following sections describe the IPv6 features supported on the Cisco MWR 2941.

•Supported IPv6 Features

•Supported IPv6 Commands

•Sample IPv6 Configurations

Supported IPv6 Features

Table 1 summarizes the supported IPv6 features in Release 15.1(1)MR. For information about how to configure these features, see the hyperlinked section or refer to the IPv6 Configuration Guide, Cisco IOS Release 15.1S.

Table 1 Supported IPv6 Features

Implementing IPv6 Addressing and Basic Connectivity
Implementing Bidirectional Forwarding Detection for IPv6
Implementing Multiprotocol BGP for IPv6
Implementing DHCP for IPv6
Implementing IS-IS for IPv6
Implementing IPv6 for Network Management
Implementing IPv6 over MPLS
Implementing IPv6 VPN over MPLS
Implementing OSPF for IPv6
Implementing QoS for IPv6
Implementing Static Routes for IPv6

IPv6 Limitations

For information about IPv6 limitations Release Notes for Cisco MWR 2941-DC Mobile Wireless Edge Router, Release 15.1(1)MR .

Supported IPv6 Commands

Table 2 summarizes the supported commands in Release 15.1(1)MR. For more information about these commands, refer to the Cisco IOS IPv6 Command Reference.

Table 2 Supported IPv6 Commands

aaa new-model	ipv6 ospf hello-interval	show clock
clear cef table	ipv6 ospf mtu-ignore	show ipv6 cef
clear ipv6 dhcp binding	ipv6 ospf name-lookup	show ipv6 cef adjacency
clear ipv6 dhcp client	ipv6 ospf neighbor	show ipv6 cef non-recursive
clear ipv6 dhcp conflict	ipv6 ospf network	show ipv6 cef platform
clear ipv6 dhcp relay binding	ipv6 ospf priority	show ipv6 cef summary
clear ipv6 mtu	ipv6 ospf retransmit-interval	show ipv6 cef switching statistics
clear ipv6 neighbors	ipv6 ospf transmit-delay	show ipv6 cef traffic prefix-length
clear ipv6 route	ipv6 prefix-list	show ipv6 cef tree
clear ipv6 traffic	ipv6 prefix-list sequence-number	show ipv6 cef vrf
crypto key generate rsa	ipv6 route	show ipv6 dhcp
debug ipv6 cef drop	ipv6 route static bfd	show ipv6 dhcp binding
debug ipv6 cef events	ipv6 router ospf	show ipv6 dhcp conflict
debug ipv6 cef receive	ipv6 source-route	show ipv6 dhcp database
debug ipv6 cef table	ipv6 unicast-routing	show ipv6 dhcp interface
debug ipv6 dhcp	match dscp	show ipv6 dhcp pool
debug ipv6 dhcp database	match protocol	show ipv6 interface
debug ipv6 icmp	match protocol (zone)	show ipv6 mtu
debug ipv6 nd	maximum-paths (IPv6)	show ipv6 neighbors
debug ipv6 packet	mpls ldp router-id	show ipv6 ospf
hostname	neighbor activate	show ipv6 ospf border-routers
ip address	neighbor ebgp-multihop	show ipv6 ospf database
ip unnumbered	neighbor remote-as	show ipv6 ospf event
ipv6 address	neighbor send-community	show ipv6 ospf flood-list
ipv6 address anycast	neighbor send-label	show ipv6 ospf graceful-restart
ipv6 address autoconfig	neighbor translate-update	show ipv6 ospf interface
ipv6 address eui-64	neighbor update-source	show ipv6 ospf neighbor
ipv6 address link-local	network (BGP and multiprotocol BGP)	show ipv6 ospf request-list
ipv6 cef	network (IPv6)	show ipv6 ospf retransmission-list
ipv6 cef accounting	passive-interface (IPv6)	show ipv6 ospf statistics
ipv6 dhcp database	ping	show ipv6 ospf summary-prefix
ipv6 dhcp pool	ping ipv6	show ipv6 ospf timers rate-limit
ipv6 dhcp server	ping vrf	show ipv6 ospf traffic
ipv6 enable	prefix-delegation	show ipv6 ospf virtual-links
ipv6 hop-limit	prefix-delegation pool	show ipv6 protocols
ipv6 host	set dscp	show ipv6 route
ipv6 icmp error-interval	show adjacency	show ipv6 route summary
ipv6 mtu	show bfd neighbors	show ipv6 route vrf
ipv6 nd advertisement-interval	show bfd summary	show ipv6 routers
ipv6 nd cache interface-limit (global)	show bgp ipv6 unicast	show ipv6 static
ipv6 nd cache interface-limit (interface)	show bgp ipv6 community	show ipv6 traffic
ipv6 nd dad attempts	show bgp ipv6 community-list	show isis database
ipv6 nd dad time	show bgp ipv6 unicast dampening dampened-paths	show isis ipv6 rib
ipv6 nd managed-config-flag	show bgp ipv6 filter-list	show isis spf-log
ipv6 nd ns-interval	show bgp ipv6 flap-statistics	show isis topology
ipv6 nd other-config-flag	show bgp ipv6 inconsistent-as	show key chain
ipv6 nd prefix	show bgp ipv6 labels	show mpls forwarding-table
ipv6 nd ra interval	show bgp ipv6 neighbors	ssh
ipv6 nd ra lifetime	show bgp ipv6 paths	summary-prefix (IPv6 OSPF)
ipv6 nd ra suppress	show bgp ipv6 peer-group	synchronization (IPv6)
ipv6 nd reachable-time	show bgp ipv6 prefix-list	telnet
ipv6 nd router-preference	show bgp ipv6 quote-regexp	telnet
ipv6 neighbor	show bgp ipv6 regexp	timers lsa arrival
ipv6 ospf area	show bgp ipv6 route-map	timers pacing flood (IPv6)
ipv6 ospf authentication	show bgp ipv6 summary	timers pacing lsa-group (IPv6)
ipv6 ospf bfd	show bgp vpnv6 unicast	timers pacing retransmission (IPv6)
ipv6 ospf cost	show cdp entry	timers spf (IPv6)
ipv6 ospf database-filter all out	show cdp neighbors	timers throttle lsa
ipv6 ospf dead-interval	show cef	timers throttle spf
ipv6 ospf demand-circuit	show cef interface	traceroute
ipv6 ospf encryption	show cef table	vrf definition
ipv6 ospf flood-reduction	show clns neighbors	vrf forwarding

Sample IPv6 Configurations

The following sections provide sample configurations for IPv6.

•Basic Connectivity

•Static Route

•BFD

•Multiprotocol BGP

•DHCP

•IS-IS

•Network Management

•IPv6 over MPLS

•IPv6 VPN over MPLS

•OSPFv3

•QoS

This section displays partial configurations intended to demonstrate specific features.

Basic Connectivity

The following example shows how to enable IPv6 on the router.

ipv6 unicast-routing

ipv6 cef

ipv6 address 

For more information about configuring basic IPv6 connectivity, refer to Implementing IPv6 Addressing and Basic Connectivity.

Static Route

The following example shows how to configure an IPv6 static route on the Cisco MWR 2941.

Router# configure terminal

Router(config)# ipv6 route 2001:DB8::/64 102::2

Router(config)# exit

Router#

For more information about how to configure static routes for IPv6, see Implementing Static Routes for IPv6.

BFD

The following examples show how to configure BFD for IPv6.

•Example: Specifying an IPv6 Static BFDv6 Neighbor

•Example: Associating an IPv6 Static Route with a BFDv6 Neighbor

•Example: Displaying OSPF Interface Information about BFD

•Example: IPv6 VPN Configuration Using IPv4 Next Hop

Example: Specifying an IPv6 Static BFDv6 Neighbor

The following example specifies a fully configured IPv6 static BFDv6 neighbor. The interface is Ethernet 0/0 and the neighbor address is 2001::1.

Router(config)# ipv6 route static bfd ethernet 0/0 2001:DB8:1::1

Example: Associating an IPv6 Static Route with a BFDv6 Neighbor

In this example, the IPv6 static route 2001:0DB8::/32 is associated with the BFDv6 neighbor 2001:DB8:1::1 over the Ethernet 0/0 interface:

Router(config)# ipv6 route static bfd ethernet 0/0 2001:DB8:1::1

Router(config)# ipv6 route 2001:0DB8::/32 ethernet 0/0 2001:DB8:1::1

Example: Displaying OSPF Interface Information about BFD

The following display shows that the OSPF interface is enabled for BFD:

Router# show ipv6 ospf interface 

Serial10/0 is up, line protocol is up 

  Link Local Address 2001:DB8:1::1, Interface ID 42 

  Area 1, Process ID 1, Instance ID 0, Router ID 10.0.0.1 

  Network Type POINT_TO_POINT, Cost: 64 

  Transmit Delay is 1 sec, State POINT_TO_POINT, BFD enabled 

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 

    Hello due in 00:00:07 

  Index 1/1/1, flood queue length 0 

  Next 0x0(0)/0x0(0)/0x0(0) 

  Last flood scan length is 1, maximum is 1 

  Last flood scan time is 0 msec, maximum is 0 msec 

  Neighbor Count is 1, Adjacent neighbor count is 1

    Adjacent with neighbor 10.1.0.1

  Suppress hello for 0 neighbor(s)

For more information about how to configure BFD, refer to Implementing Bidirectional Forwarding Detection for IPv6.

Multiprotocol BGP

Example: IPv6 VPN Configuration Using IPv4 Next Hop

The following example illustrates a 6VPE next hop:

interface Loopback0

 ip address 192.168.2.11 255.255.255.255

! 

router bgp 100

 neighbor 192.168.2.10 remote-as 100

 neighbor 192.168.2.10 update-source Loopback0

!

 address-family vpnv6

 neighbor 192.168.2.10 activate

 neighbor 192.168.2.10 send-community extended

 exit-address-family

By default, the next hop advertised will be the IPv6 VPN address:

[0:0]::FFFF:192.168.2.10

Note that it is a 192-bit address in the format of [RD]::FFFF:IPv4-address.

When the BGP IPv6 VPN peers share a common subnet, the MP_REACH_NLRI attribute contains a link-local address next hop in addition to the global address next hop. This situation typically occurs in an interautonomous-system topology when ASBRs are facing each other. In that case, the link-local next hop is used locally, and the global next hop is readvertised by BGP.

The BGP next hop is the keystone for building the label stack. The inner label is obtained from the BGP NLRI, and the outer label is the label distribution protocol (LDP) label to reach the IPv4 address embedded into the BGP next hop.

For more information about how to configure multiprotocol BGP, refer to Implementing Multiprotocol BGP for IPv6.

DHCP

The following examples show how to configure DHCP for IPv6:

•Stateful DHCP—Server

•Stateful DHCP—Client

•Stateless DHCP—Server

•Stateless DHCP—Client

Stateful DHCP—Server

ipv6 dhcp pool dhcp-pool

prefix-delegation pool client-prefix-pool1 lifetime 1800 600

dns-server 2001:0DB8:3000:3000::42

domain-name example.com

interface vlan 102

ipv6 address 102::2/64

ipv6 dhcp server dhcp-pool

ipv6 local pool client-prefix-pool1 2001:0DB8:1200::/48 48

Stateful DHCP—Client

interface vlan 102

ipv6 dhcp client pd prefix-from-provider

interface vlan 101

ipv6 address prefix-from-provider 2001:0DB8::5:0:0:0:100/64

Stateless DHCP—Server

ipv6 dhcp pool dhcp-pool

dns-server 2001:0DB8:3000:3000::42

domain-name example.com

interface vlan 102

ipv6 address 2001:0DB8:1234:42::1/64

ipv6 dhcp server dhcp-pool

Stateless DHCP—Client

interface vlan 102

ipv6 address autoconfig

For more information about how to configure DHCP, refer to Implementing DHCP for IPv6.

IS-IS

The following example shows how to configure IS-IS routing for IPv6 traffic.

interface Vlan306

 mtu 4470

 ip address 10.36.1.1 255.255.255.0

 no ptp enable

 ipv6 address 2001:DB8:1::1/64

 ipv6 enable

 ipv6 router isis isis-600-1

 mpls ip

 bfd interval 150 min_rx 50 multiplier 3

!

router isis isis-600-1

 net net 2001:DB8.0000.0000.0003.00

 bfd all-interfaces

 !

 address-family ipv6

  maximum-paths 3

 exit-address-family

!

For more information about how to configure IS-IS for IPv6, refer to Implementing IS-IS for IPv6.

Network Management

aaa new-model

ip domain name example.com

username myusername password 0 mypassword

crypto key generate rsa

  int vlan 102

ipv6 address 2001:DB8::2/64

For more information about how to configure network management for IPv6, refer to Implementing IPv6 for Network Management.

IPv6 over MPLS

The following example shows how to configure IPv6 over MPLS.

router bgp 100

bgp router-id 192.168.1.1

bgp log-neighbor-changes

no bgp default route-target filter

no bgp default ipv4-unicast

neighbor 10.0.4.4 remote-as 100

neighbor 10.0.4.4 update-source Loopback0

!

address-family ipv4

  neighbor 10.0.4.4 activate

  no auto-summary

exit-address-family

!

address-family ipv6

  redistribute ospf 6

  network 2001:DB8:0::/64

  network 2001:DB8:1::/64

  neighbor 10.0.4.4 activate

  neighbor 10.0.4.4 send-label

exit-address-family

!

For more information about how to configure IPv6 over MPLS, refer to Implementing IPv6 over MPLS.

IPv6 VPN over MPLS

The following example shows how to configure an IPv6 VPN over MPLS (6VPE).

vrf definition B

rd 52:62

address-family ipv4

  route-target export 52:62

  route-target import 52:62

exit-address-family

!

address-family ipv6

  route-target export 52:62

  route-target import 52:62

exit-address-family

!

vrf definition C

rd 53:63

!

address-family ipv4

  route-target export 53:63

  route-target import 53:63

exit-address-family

!

address-family ipv6

  route-target export 53:63

  route-target import 53:63

exit-address-family

interface Vlan52

vrf forwarding B

ipv6 address 2001:DB8:0:1/64

ipv6 enable

!

interface Vlan53

vrf forwarding C

ipv6 address 2001:DB8:1:1/64

ipv6 enable

!

router bgp 100

bgp router-id 1.1.1.1

bgp log-neighbor-changes

no bgp default route-target filter

no bgp default ipv4-unicast

neighbor 10.10.4.4 remote-as 100

neighbor 10.10.4.4 update-source Loopback0

!

address-family ipv4

  neighbor 10.10.4.4 activate

  no auto-summary

exit-address-family

!

address-family vpnv6

  neighbor 10.10.4.4 activate

  neighbor 10.10.4.4 send-community both

exit-address-family

!

address-family ipv6 vrf B

  redistribute connected

  redistribute static

exit-address-family

!

address-family ipv6 vrf C

  neighbor 2001:DB8:100:1:: remote-as 104

  neighbor 2001:DB8:100:1:: activate

exit-address-family

For more information about how to configure IPv6 VPN over MPLS, see Implementing IPv6 VPN over MPLS.

OSPFv3

The following example shows to to configure OSPF version 3 in order to route IPv6 traffic.

!

interface Vlan405

 ip address 192.168.1.2 255.255.255.0

 no ptp enable

 ipv6 address 2001:DB8:1::2/64

 ipv6 ospf 600 area 200

 mpls ip

 bfd interval 250 min_rx 100 multiplier 3

ipv6 router ospf 600

 router-id 10.0.5.6

 bfd all-interfaces

 event-log size 5 one-shot

 timers throttle spf 200 500 5000

 timers throttle lsa 0 20 5000

 timers lsa arrival 15

 timers pacing flood 15

!

For more information about how to configure OSPF v3, see Implementing OSPF for IPv6.

QoS

The following partial configuration examples show how to use QoS features on a network with IPv4 and IPv6 traffic:

•Applying Ingress QoS to IPv6 Traffic

•Applying Ingress QoS to IPv4 Traffic

•Applying Ingress QoS to IPv4 and IPv6 Traffic

•Applying Egress QoS to IPv4 and IPv6 Traffic

Applying Ingress QoS to IPv6 Traffic

The following example classifies IPv6 traffic based on DSCP value and marks the traffic with a CoS and QoS group value.

class-map match-all ipv6_llq

  match protocol ipv6

  match dscp af43 af41 cs6 cs7

class-map match-all ipv6_premium

  match protocol ipv6

  match dscp af33, af13

class-map match-all ipv6_hsps

  match protocol ipv6

  match dscp af12

policy-map input-policy

 class ipv6_llq

  set cos 5

  set qos-group 5

 class ipv6_prem

  set qos-group 4

  set cos 4

 class ipv6_hsps

  set cos 3

  set qos-group 3

interface GigabitEthernet0/4

 switchport access vlan 1000

 switchport mode access

 service-policy input input-policy

Applying Ingress QoS to IPv4 Traffic

The following example classifies IPv4 traffic based on DSCP value and marks the traffic with a CoS and QoS group value.

class-map match-all ipv4_proto

   match protocol ip

   match dscp af11  af23  af33  af43

policy-map input-policy

 class ipv4_proto

  set cos 5

  set qos-group 5

interface GigabitEthernet0/4

 switchport access vlan 1000

 switchport mode access

 service-policy input input-policy

Applying Ingress QoS to IPv4 and IPv6 Traffic

The following example classifies both IPv4 and IPv6 traffic based on the DSCP value and marks the traffic with a CoS and QoS group value.

class-map match-any llq

  match dscp ef 

  match dscp af43 

  match dscp af41 

  match dscp cs7 

  match dscp cs6

policy-map input-policy

 class llq

  set cos 5

  set qos-group 5

interface GigabitEthernet0/4

 switchport access vlan 1000

 switchport mode access

 service-policy input input-policy

Applying Egress QoS to IPv4 and IPv6 Traffic

The following example performs the following QoS functions:

•Matches all IPv4 and IPv6 traffic based on QoS group

•Applies egress queuing based on QoS group

•Applies egress shaping to all traffic

class-map match-all q0

 match qos-group 0

class-map match-all q1

 match qos-group 1

class-map match-all q2

 match qos-group 2

class-map match-all q3

 match qos-group 3

policy-map child_policy_egress

 class q3

  priority percent 60

 class q2

  bandwidth remaining percent 50 

 class q1

  bandwidth remaining percent 45 

class q0

  bandwidth remaining percent 4 

policy-map parent_policy_egress

 class class-default

  shape average 380000000

  service-policy child_policy_egress

interface GigabitEthernet0/5

 switchport trunk allowed vlan 331

 switchport mode trunk

 service-policy output parent_policy_egress

For more information about how to configure QoS for IPv6, see Implementing QoS for IPv6.