Table Of Contents

VSS-Enabled Campus Best Practice Configuration Example

End-to-End Device Configurations

VSS Specific

Layer-2 Domain

Layer-3 Domain

EIGRP MEC

EIGRP ECMP

OSPF MEC

OSPF ECMP

VSS-Enabled Campus Best Practice Configuration Example

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Figure A-1 illustrates the baseline best practice configuration required to set up basic VSS enabled network. The circle indicates the essential steps required to create the VSS systems from standalone. The red text highlights the important CLI information with VSS configuration. Comments are provided in blue italic font.

Figure A-1 Overall VSS-Enabled Campus Best Practice Configuration Summary

End-to-End Device Configurations

The end-to-end devices configuration is categorized into three major sections. Each section configuration contains specific CLI which is a required as part of best practice configuration and corresponding explanation.

•VSS and L2 Domain- Includes above base configuration as well as L2 domain configuration

•Access-layer- Sample L2 domain configuration

•L3 Domain - Includes global L3 configuration for VSS and core routers. Then separate section for specifics topologies (ECMP and MEC) for EIGRP and OSPF. In addition, the core devices configuration shown below are standalone router/devices.

VSS Specific

VSS Global Configuration

switch virtual domain 10 ! Must configure unique domain ID

 switch mode virtual

 switch 1 priority 110 ! Not needed, helps in operational mgmt

 switch 2 priority 100 ! Not needed, helps in operational mgmt

 dual-active exclude interface GigabitEthernet1/5/3 ! Connectivity to VSS during dual 
active

mac-address use-virtual ! Required for consistent MAC address

dual-active detection pagp trust channel-group 202 ! Enhanced PAgP based dual active 
detection

redundancy ! Default SSO Enabled

 main-cpu 

  auto-sync running-config 

 mode sso 

Switch 1

interface Port-channel1 ! Unique port-channel number for SW 1

 description VSL Link from Switch 1 

 no switchport 

 no ip address 

switch virtual link 1 ! Defines switch ID for SW 1

 mls qos trust cos 

 no mls qos channel-consistency 

interface ten 1/5/4 

channel-group 1 mode on ! EC mode is ON - EtherChannel Managemeent Protocol off

interface ten 1/1/1 

channel-group 1 mode on 

Switch 2

interface Port-channel2 ! Unique port-channel number for SW 1

 description VSL Link from Switch 2 

 no switchport 

 no ip address 

switch virtual link 2 ! Defines switch ID for SW 2

 mls qos trust cos 

 no mls qos channel-consistency

interface ten 2/5/4 

channel-group 2 mode on ! EC mode is ON - EtherChannel Managemeent Protocoloff

interface ten 2/1/1 

channel-group 2 mode on

Layer-2 Domain

VSS

udld enable  

vtp domain campus-test  

vtp mode transparent  

spanning-tree mode rapid-pvst  

no spanning-tree optimize bpdu transmission  

spanning-tree extend system-id  

spanning-tree vlan 2-999 priority 24576 !  STP Root

port-channel load-balance src-dst-mixed-ip-port !  Enhanced hash algorithem

vlan 400 !  VLANs spanning multiple access-layer SWs

 name L2_ Spaned_VLAN _400  

vlan 450  

 name L2_ Spaned_VLAN _450  

vlan 500  

 name L2_ Spaned_VLAN _500  

vlan 550  

 name L2_ Spaned_VLAN _550  

vlan 600  

 name L2_ Spaned_VLAN _600  

vlan 650  

 name L2_Spaned_VLAN_650  

vlan 900  

 name NetMgmt_VLAN_900  

vlan 999   

 name Unused_Port_VLAN_999  

vlan 2  

 name cr7-3750-Stack-Data-VLAN  

!  

vlan 102  

 name cr7-3750-Stack-Voice-VLAN  

interface Vlan2 ! Sample VLAN interface configuration

 ip address 10.120.2.1 255.255.255.0  

 no ip redirects  

 no ip unreachables  

 ip flow ingress  

 ip pim sparse-mode  

 logging event link-status  

 hold-queue 150 in  

 hold-queue 150 out  

!  

VSS—Multi-Chassis EtherChannel

PAgP

interface GigabitEthernet1/8/23  !  Interface on SW 1

 description Access Switch Facing Interface   

 switchport   

 switchport trunk encapsulation dot1q   

 switchport trunk native vlan 202   

switchport mode dynamic desirable ! Trunk mod dynamic and desirable

 switchport trunk allowed vlan 2,102,400,450,500,550,600,650,900 !  Only allow need VLANs 
for a given trunk

logging event link-status !  Logging for link status

logging event trunk-status !  Logging for trunk status

logging event bundle-status !  Logging for port-channel status

 load-interval 30  

 mls qos trust dscp  

channel-protocol pagp   

channel-group 202 mode desirable !  Define Port-channel, PAgP mode desirable 

interface GigabitEthernet2/8/23  !  Interface on SW 2

 description Access Switch Facing Interface 

 switchport   

 switchport trunk encapsulation dot1q   

 switchport trunk native vlan 202   

switchport mode dynamic desirable  

 switchport trunk allowed vlan 2,102,400,450,500,550,600,650,900  

 logging event link-status  

 logging event trunk-status  

 logging event bundle-status  

 load-interval 30  

 mls qos trust dscp  

 load-interval 30  

channel-protocol pagp   

channel-group 202 mode desirable    

interface Port-channel202  !  Automatically created by defining at interfaces

 description Access Switch MEC

 switchport  

 switchport trunk encapsulation dot1q  

 switchport trunk native vlan 202  

 switchport trunk allowed vlan 2,102,400,450,500,550,600,650,900  

logging event link-status  

logging event spanning-tree status ! STP logging enabled on port-channel 

 load-interval 30  

 mls qos trust dscp  

 spanning-tree portfast ! Optional - helps during initialization

 hold-queue 2000 out 

LACP

LACP Sample Configuration

interface GigabitEthernet1/8/23  

 description Access Switch Facing Interface

 switchport  

 switchport trunk encapsulation dot1q  

 switchport trunk native vlan 202  

switchport mode dynamic desirable  

 switchport trunk allowed vlan 2,102,400,450,500,550,600,650,900  

logging event link-status  

logging event trunk-status  

logging event bundle-status  

 load-interval 30  

 mls qos trust dscp  

 channel-protocol lacp  

 channel-group 202 mode active  

 hold-queue 2000 out  

interface GigabitEthernet2/8/23  

 description Access Switch Facing Interface

 switchport  

 switchport trunk encapsulation dot1q  

 switchport trunk native vlan 202  

switchport mode dynamic desirable  

 switchport trunk allowed vlan 2,102,400,450,500,550,600,650,900  

logging event link-status  

logging event trunk-status  

logging event bundle-status  

 load-interval 30  

 mls qos trust dscp  

 channel-protocol lacp  

 channel-group 202 mode active  

 hold-queue 2000 out  

interface Port-channel202 !  Automatically created by defining at interfaces

 description Access Switch MEC

 switchport 

 switchport trunk encapsulation dot1q 

 switchport trunk native vlan 202 

 switchport trunk allowed vlan 2,102,400,450,500,550,600,650,900 

logging event link-status 

logging event spanning-tree status 

 load-interval 30 

 mls qos trust dscp 

 spanning-tree portfast ! Optional - helps during initialization

 hold-queue 2000 out 

Access-Layer Switch

Sample Configuration (Platform Specific Configuration Varies)

interface GigabitEthernet0/27 

 description Uplink to VSS Switch Gig 1/8/24  

 switchport trunk encapsulation dot1q 

 switchport trunk native vlan 203 

switchport mode dynamic desirable  

 switchport trunk allowed vlan 3,103,400,450,500,550,600,650,900 

 logging event link-status  

 logging event trunk-status  

 logging event bundle-status  

 carrier-delay msec 0 

 srr-queue bandwidth share 1 70 25 5 

 srr-queue bandwidth shape  3  0  0  0  

 priority-queue out  

 mls qos trust dscp 

channel-protocol pagp  

channel-group 1 mode desirable   

interface GigabitEthernet0/28 

 description Uplink to VSS Switch Gig 2/8/24 

 switchport trunk encapsulation dot1q 

 switchport trunk native vlan 203 

 switchport trunk allowed vlan 3,103,400,450,500,550,600,650,900 

 switchport mode dynamic desirable 

 logging event link-status  

 logging event trunk-status  

 logging event bundle-status  

 carrier-delay msec 0 

 srr-queue bandwidth share 1 70 25 5 

 srr-queue bandwidth shape  3  0  0  0  

 priority-queue out  

 mls qos trust dscp 

channel-protocol pagp  

channel-group 1 mode desirable   

interface Port-channel1 !  Automatically created by defining at interfaces

 description EC Uplink to VSS  

 switchport trunk encapsulation dot1q 

 switchport trunk native vlan 203 

 switchport trunk allowed vlan 3,103,400,450,500,550,600,650,900 

 switchport mode dynamic desirable 

logging event link-status 

logging event spanning-tree status 

 carrier-delay msec 0 

 spanning-tree portfast ! Optional - helps during initialization

Layer-3 Domain

The Layer 3 domain represents VSS interconnection to the core-layer. The core-layer devices configuration shown below are standalone router/switch.

Global Configuration

mls ip cef load-sharing <option> !  Apply Campus Best Practices

Multicast

VSS

ip multicast-routing   

ip pim rp-address 10.122.100.1 GOOD-IPMC override !  RP mapping with filter

ip access-list standard GOOD-IPMC  

 permit 224.0.1.39  

 permit 224.0.1.40  

 permit 239.192.240.0 0.0.3.255  

 permit 239.192.248.0 0.0.3.255  

Core 1 Standalone Router (No VSS)

Core RP ANYCAST - Primary

ip multicast-routing   

interface Loopback0  

 description MSDP PEER INT !  MSDP Loopback

 ip address 10.122.10.1 255.255.255.255  

interface Loopback1  

 description ANYCAST RP ADDRESS (PRIMARY) !  Anycast RP Primary 

 ip address 10.122.100.1 255.255.255.255  

interface Loopback2  

 description Garbage-CAN RP  

 ip address 2.2.2.2 255.255.255.255  

interface Port-channel1 !  Core 1- Core2 L3 for MSDP

 description Channel to Peer Core Node  

 dampening  

 ip address 10.122.0.18 255.255.255.254  

 ip pim sparse-mode 

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

ip access-list standard GOOD-IPMC  

 permit 224.0.1.39  

 permit 224.0.1.40  

 permit 239.192.240.0 0.0.3.255  

 permit 239.192.248.0 0.0.3.255  

ip msdp peer 10.122.10.2 connect -source Loopback0 ! MSDP Configuration

ip msdp description 10.122.10.2 ANYCAST-PEER-6k-core-2 

ip msdp cache -sa-state 

ip msdp originator-id Loopback0 

Core 2 Standalone Router (No VSS)

ip multicast-routing   

interface Loopback0  

 description MSDP PEER INT  

 ip address 10.122.10.2 255.255.255.255  

interface Loopback1  

 description ANYCAST RP ADDRESS   

 ip address 10.122.100.1 255.255.255.255 ! Secondary ANYCAST RP

 delay 600 

interface Loopback2  

 description Garbage-CAN RP  

 ip address 2.2.2.2 255.255.255.255  

interface Port-channel1  

 description Channel to Peer Core node  

 dampening  

 ip address 10.122.0.19 255.255.255.254  

 ip pim sparse-mode  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

ip pim rp-address 10.122.100.1 GOOD-IPMC override  

ip access-list standard GOOD-IPMC  

 permit 224.0.1.39  

 permit 224.0.1.40  

 permit 239.192.240.0 0.0.3.255  

 permit 239.192.248.0 0.0.3.255  

ip msdp peer 10.122.10.1 connect-source Loopback0  

ip msdp description 10.122.10.1 ANYCAST-PEER-6k-core-1  

ip msdp cache-sa-state  

ip msdp originator-id Loopback0  

EIGRP MEC

VSS

router eigrp 100  

 passive-interface default  

 no passive-interface Port-channel200  

 no passive-interface Port-channel201  

 network 10.0.0.0  

eigrp log-neighbor-warnings  

eigrp log-neighbor-changes  

 no auto-summary  

 eigrp router-id 10.122.102.1  

 eigrp event-log-size 3000  

 nsf !  Enable NSF Capability

interface Port-channel200 !  Create L3 MEC Interface first

 description 20 Gig MEC to CORE-1 (cr2-6500-1 4/1-4/3) 

 no switchport  

 dampening  

 ip address 10.122.0.26 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip summary-address eigrp 100 10.125.0.0 255.255.0.0 5 !  Summarization for Access-subnets

 ip summary-address eigrp 100 10.120.0.0 255.255.0.0 5  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

interface Port-channel201  

 description 20 Gig to CORE-2 (cr2-6500-1 4/1-4/3) 

 no switchport  

 dampening  

 ip address 10.122.0.21 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip summary-address eigrp 100 10.125.0.0 255.255.0.0 5  

 ip summary-address eigrp 100 10.120.0.0 255.255.0.0 5  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

interface TenGigabitEthernet1/2/1 

 description 10 GigE to Core 1 

 no switchport 

 no ip address 

 logging event link-status 

 logging event bundle-status 

 load-interval 30 

 carrier-delay msec 0 

 mls qos trust dscp 

 channel-protocol pagp 

 channel-group 200 mode desirable 

 hold-queue 2000 in 

 hold-queue 2000 out 

! 

interface TenGigabitEthernet1/2/2 

 description 10 GigE to Core 2 

 no switchport 

 no ip address 

 logging event link-status 

 logging event bundle-status 

 load-interval 30 

 carrier-delay msec 0 

 mls qos trust dscp 

 channel-protocol pagp 

 channel-group 201 mode desirable 

 hold-queue 2000 in 

 hold-queue 2000 out 

interface TenGigabitEthernet2/2/1 

 description to core 1 

 no switchport 

 no ip address 

 logging event link-status 

 logging event bundle-status 

 logging event spanning-tree status 

 load-interval 30 

 mls qos trust dscp 

 channel-protocol pagp 

 channel-group 200 mode desirable 

 hold-queue 2000 in 

 hold-queue 2000 out 

interface TenGigabitEthernet2/2/2 

 description 10 GigE to Core 2 

 no switchport 

 no ip address 

 logging event link-status 

 logging event bundle-status 

 load-interval 30 

 mls qos trust dscp 

 channel-protocol pagp 

 channel-group 201 mode desirable 

 hold-queue 2000 in 

 hold-queue 2000 out 

Core 1 Standalone Router (No VSS)

router eigrp 100  

 passive-interface default  

 no passive-interface Port-channel1  

 no passive-interface Port-channel20  

 no passive-interface Port-channel221  

 network 10.0.0.0  

 no auto-summary  

eigrp log-neighbor-warnings  

eigrp log-neighbor-changes  

eigrp event-log-size 3000  

interface Port-channel20  

 description 20 Gig MEC to VSS 1/2/1 2/2/1  

 dampening  

 ip address 10.122.0.27 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

Core 2 Standalone Router (No VSS)

router eigrp 100  

 passive-interface default  

 no passive-interface Port-channel1  

 no passive-interface Port-channel20  

 no passive-interface Port-channel221  

 network 10.0.0.0  

 no auto-summary  

eigrp log-neighbor-warnings  

eigrp log-neighbor-changes  

eigrp event-log-size 3000  

interface Port-channel21  

 description 20 Gig to VSS 1/2/2-2/2/2  

 dampening  

 ip address 10.122.0.20 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

EIGRP ECMP

VSS

router eigrp 100  

 passive-interface default  

 no passive-interface TenGigabitEthernet1/2/1  

 no passive-interface TenGigabitEthernet1/2/2  

 no passive-interface TenGigabitEthernet2/2/1  

 no passive-interface TenGigabitEthernet2/2/2  

 network 10.0.0.0  

 no auto-summary  

 eigrp router-id 10.122.102.1  

 eigrp log-neighbor-warnings  

 eigrp log-neighbor-changes  

 eigrp event-log-size 3000  

 nsf !  Enable NSF Capability

interface TenGigabitEthernet1/2/1  

 description 10 GigE to Core 1  

 no switchport  

 dampening  

 ip address 10.122.0.26 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip summary-address eigrp 100 10.120.0.0 255.255.0.0 5  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

interface TenGigabitEthernet1/2/2  

 description 10 GigE to Core 2  

 no switchport  

 dampening  

 ip address 10.122.0.23 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip summary-address eigrp 100 10.120.0.0 255.255.0.0 5  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

interface TenGigabitEthernet2/2/1  

 description to Core 1 

 no switchport  

 dampening  

 ip address 10.122.0.32 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip summary-address eigrp 100 10.120.0.0 255.255.0.0 5  

 logging event link-status  

 load-interval 30  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

interface TenGigabitEthernet2/2/2  

 description 10 GigE to Core 2  

 no switchport  

 dampening  

 ip address 10.122.0.20 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip summary-address eigrp 100 10.120.0.0 255.255.0.0 5  

 logging event link-status  

 load-interval 30  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

Core 1 Standalone Router (No VSS)

router eigrp 100  

 passive-interface default  

 no passive-interface TenGigabitEthernet4/1  

 no passive-interface TenGigabitEthernet4/3  

 network 10.0.0.0  

 no auto-summary  

eigrp log-neighbor-warnings  

eigrp log-neighbor-changes  

eigrp event-log-size 3000  

interface TenGigabitEthernet4/1  

 description To VSS Ten1/2/1  

 dampening  

 ip address 10.122.0.27 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

interface TenGigabitEthernet4/3  

 description To VSS Ten2/2/1  

 dampening  

 ip address 10.122.0.33 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 logging event link-status  

 logging event bundle-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

Core 2 Standalone Router (No VSS)

router eigrp 100  

 passive-interface default  

 no passive-interface TenGigabitEthernet4/1  

 no passive-interface TenGigabitEthernet4/3  

 network 10.0.0.0  

 no auto-summary  

eigrp log-neighbor-warnings  

eigrp log-neighbor-changes  

eigrp event-log-size 3000  

interface TenGigabitEthernet4/1  

 description To VSS Ten 1/2/2  

 dampening  

 ip address 10.122.0.22 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

interface TenGigabitEthernet4/3  

 description To VSS Ten 2/2/2  

 dampening  

 ip address 10.122.0.21 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

OSPF MEC

VSS

router ospf 100  

 router-id 10.122.0.235  

 log-adjacency-changes detail  

 auto-cost reference-bandwidth 20000 !  Optional

 nsf !  Enable NSF Capability

 area 120 stub no-summary  

 area 120 range 10.120.0.0 255.255.0.0 cost 10  

 area 120 range 10.125.0.0 255.255.0.0 cost 10  

 passive-interface default  

 no passive-interface Port-channel200  

 no passive-interface Port-channel201  

 network 10.120.0.0 0.0.255.255 area 120  

 network 10.122.0.0 0.0.255.255 area 0  

 network 10.125.0.0 0.0.255.255 area 120  

interface Port-channel200  

 description 20 Gig MEC to VSS (cr2-6500-1 4/1-4/3) 

 no switchport  

 dampening  

 ip address 10.122.0.26 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

interface Port-channel201  

 description 20 Gig to VSS (cr2-6500-1 4/1-4/3) 

 no switchport  

 dampening  

 ip address 10.122.0.21 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

Core 1 Standalone Router No VSS)

router ospf 100  

 router-id 10.254.254.7  

 log-adjacency-changes detail ! Helps in NSF Restart Activities

 auto-cost reference-bandwidth 20000 !  Optional

 passive-interface default  

 no passive-interface Port-channel1  

 no passive-interface Port-channel20  

 network 10.122.0.0 0.0.255.255 area 0  

interface Port-channel20  

 description 20 Gig MEC to VSS 1/2/1 2/2/1  

 dampening  

 ip address 10.122.0.27 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

Core 2 Standalone Router (No VSS)

router ospf 100  

 router-id 10.254.254.7  

 log-adjacency-changes detail  

 auto-cost reference-bandwidth 20000 !  Optional

 passive-interface default  

 no passive-interface Port-channel1  

 no passive-interface Port-channel20  

 network 10.122.0.0 0.0.255.255 area 0  

interface Port-channel21  

 description 20 Gig to VSS 1/2/2-2/2/2  

 dampening  

 ip address 10.122.0.20 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

OSPF ECMP

VSS

router ospf 100  

 router-id 10.122.0.235  

 log-adjacency-changes detail  

 auto-cost reference-bandwidth 20000 !  Optional

 nsf !  Enable NSF Capability

 area 120 stub no-summary  

 area 120 range 10.120.0.0 255.255.0.0 cost 10  

 area 120 range 10.125.0.0 255.255.0.0 cost 10  

 passive-interface default  

 no passive-interface TenGigabitEthernet1/2/1  

 no passive-interface TenGigabitEthernet1/2/2  

 no passive-interface TenGigabitEthernet2/2/1  

 no passive-interface TenGigabitEthernet2/2/2  

 network 10.120.0.0 0.0.255.255 area 120  

 network 10.122.0.0 0.0.255.255 area 0  

 network 10.125.0.0 0.0.255.255 area 120  

interface TenGigabitEthernet1/2/1  

 description 10 GigE to Core 1  

 no switchport  

 dampening  

 ip address 10.122.0.26 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

interface TenGigabitEthernet1/2/2  

 description 10 GigE to Core 2  

 no switchport  

 dampening  

 ip address 10.122.0.23 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

interface TenGigabitEthernet2/2/1  

 description to Core 1  

 no switchport  

 dampening  

 ip address 10.122.0.32 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

interface TenGigabitEthernet2/2/2  

 description 10 GigE to Core 2  

 no switchport  

 dampening  

 ip address 10.122.0.20 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

Core 1 Standalone Router (No VSS)

router ospf 100  

 router-id 10.254.254.7  

 log-adjacency-changes detail  

 auto-cost reference-bandwidth 20000 !  Optional

 passive-interface default  

 no passive-interface GigabitEthernet2/5  

 no passive-interface TenGigabitEthernet4/1  

 no passive-interface TenGigabitEthernet4/3  

 no passive-interface Port-channel1  

 network 10.122.0.0 0.0.255.255 area 0  

interface TenGigabitEthernet4/1  

 description To VSS Ten1/2/1  

 dampening  

 ip address 10.122.0.27 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

!  

interface TenGigabitEthernet4/3  

 description To VSS Ten2/2/1  

 dampening  

 ip address 10.122.0.33 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

Core 2 Standalone Router (No VSS)

router ospf 100  

 router-id 10.254.254.7  

 log-adjacency-changes detail  

 auto-cost reference-bandwidth 20000 !  Optional

 passive-interface default  

 no passive-interface GigabitEthernet2/5  

 no passive-interface TenGigabitEthernet4/1  

 no passive-interface TenGigabitEthernet4/3  

 no passive-interface Port-channel1  

 network 10.122.0.0 0.0.255.255 area 0  

interface TenGigabitEthernet4/1  

 description To VSS Ten 1/2/2  

 dampening  

 ip address 10.122.0.22 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out  

!  

!  

interface TenGigabitEthernet4/3  

 description To VSS Ten 2/2/2  

 dampening  

 ip address 10.122.0.21 255.255.255.254  

 ip flow ingress  

 ip pim sparse-mode  

 ip ospf network point-to-point  

 logging event link-status  

 load-interval 30  

 carrier-delay msec 0  

 mls qos trust dscp  

 hold-queue 2000 in  

 hold-queue 2000 out