BFD on BDI Interfaces
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1 The Cisco feature alleviates limitations on the maximum number of interfaces per system that switched virtual interfaces (SVI) impose. This document describes how to configure the Bidirectional Forwarding Detection (BFD) protocol on bridge domain interfaces (BDIs). Information About BFD on Bridge Domain Interfaces, page 1 How to Configure, page 1 Configuration Examples for, page 5 Information About BFD on Bridge Domain Interfaces BFD on Bridge Domain Interfaces Each BDI is associated with a bridge domain on which traffic is mapped using criteria defined and configured on the associated Ethernet flow points (EFPs). You can associate either single or multiple EFPs with a given bridge domain. Thus you can establish a BFD single-hop session over BDI interfaces that are defined in either a global table or a VPN routing and forwarding (VRF) table, and all existing single-hop BFD clients will be supported for BFD over BDI. The Cisco BFD on BDI feature does not affect BFD stateful switchover (SSO) on platforms that are SSO capable. How to Configure Enabling BFD on a Bridge Domain Interface Perform these steps to enable single hop BFD on an individual BDI interface. 1
2 Enabling BFD on a Bridge Domain Interface Note Multihop BFD is not interface specific so you do not need BDI interface-level configuration to establish multihop BFD sessions. Before You Begin Two or more nodes must be connected. SUMMARY STEPS 1. enable 2. configure terminal 3. interface type number 4. ip address ip-address mask 5. bfd interval milliseconds min_rx milliseconds multiplier interval-multiplier 6. exit DETAILED STEPS Step 1 Step 2 enable Router> enable configure terminal Enables privileged EXEC mode. Enter your password if prompted. Enters global configuration mode. Step 3 Step 4 Router# configure terminal interface type number Router(config)# interface bdi 100 ip address ip-address mask Configures a bridge domain interface and enters interface configuration mode. Configures an IP address for the interface. Step 5 Router(config-if)# ip address bfd interval milliseconds min_rx milliseconds multiplier interval-multiplier Enables BFD on the interface. 2
3 Associating an Ethernet Flow Point with a Bridge Domain Step 6 Router(config-if)# bfd interval 500 min_rx 500 multiplier 5 exit Router(config-if)# exit Exits interface configuration mode and returns to global configuration mode. Associating an Ethernet Flow Point with a Bridge Domain Before You Begin BFD must be enabled on both nodes. SUMMARY STEPS 1. enable 2. configure terminal 3. interface type slot/subslot/port 4. no ip address 5. negotiation auto 6. cdp enable 7. service instance id service-type 8. encapsulation dot1q vlan-id 9. rewrite ingress tag pop 1 symmetric 10. exit 11. exit 12. bridge-domain vlan-id DETAILED STEPS Step 1 enable Router> enable Enables privileged EXEC mode. Enter your password if prompted. 3
4 Associating an Ethernet Flow Point with a Bridge Domain Step 2 configure terminal Enters global configuration mode. Step 3 Step 4 Router# configure terminal interface type slot/subslot/port Router(config)# interface GigabitEthernet0/0/3 no ip address Configures an interface type and enters interface configuration mode. Disables IP processing. Step 5 Step 6 Router(config-if)# no ip address negotiation auto Router(config-if)# negotiation auto cdp enable Enables the autonegotiation protocol to configure the speed, duplex, and automatic flow control of the interface. Enables Cisco Discovery Protocol on the interface. Router(config-if)# cdp enable Step 7 Step 8 service instance id service-type Router(config-if)# service instance 2 ethernet encapsulation dot1q vlan-id Router(config-if-srv)# encapsulation dot1q 2 Configures an Ethernet service instance and enters service instance configuration mode. Enables IEEE 802.1Q encapsulation of traffic on the subinterface. Step 9 Step 10 rewrite ingress tag pop 1 symmetric Router(config-if-srv)# rewrite ingress tag pop 1 symmetric exit Router(config-if)# exit Specifies removal of the outermost tag from the frame ingressing the service instance and the addition of a tag in the egress direction. Exits service instance configuration mode and returns to interface configuration mode. 4
5 Configuration Examples for Step 11 Step 12 exit Router(config-if)# exit bridge-domain vlan-id Exits interface configuration mode and returns to global configuration mode. Associates the bridge domain with the Ethernet flow point. Router(config)# bridge-domain 2 What to Do Next Configuration Examples for Examples for The following example shows how to configure BFD on a BDI. Router#show bfd neighbors IPv4 Sessions NeighAddr LD/RD RH/RS State Int /1 Up Up BD2 Router# Router#show running interface gi0/0/3 Current configuration : 230 bytes interface GigabitEthernet0/0/3 no ip address ip pim passive ip igmp version 3 negotiation auto cdp enable service instance 2 ethernet encapsulation dot1q 2 rewrite ingress tag pop 1 symmetric bridge-domain 2 Router#show running interface bdi2 Current configuration : 127 bytes 5
6 Examples for interface BDI2 ip address bfd interval 100 min_rx 100 multiplier 3 bfd neighbor ipv And similarly for the other node: Router2#show running interface bdi2 Current configuration : 127 bytes interface BDI2 ip address bfd interval 100 min_rx 100 multiplier 3 bfd neighbor ipv ED3#show run int gig0/0/3 Current configuration : 195 bytes interface GigabitEthernet0/0/3 no ip address negotiation auto cdp enable service instance 2 ethernet encapsulation dot1q 2 rewrite ingress tag pop 1 symmetric bridge-domain 2 Router2#show bfd neighbors IPv4 Sessions NeighAddr LD/RD RH/RS State Int /2049 Up Up BD2 ED3# 6
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