双机热备_配置BAS叠加NAT双机热备示例
适用产品和版本
适用于V600R008C10及以后版本的NE40E/ME60系列产品。
组网需求
在传统的单BRAS接入用户的场景下，一旦出现链路、节点故障，所有用户的业务都会中断，业务恢复的时间也不确定。采用双机备份的部署方法，可以从业务可靠性的层次提升网络的可靠性。在网络发生故障的情况下备用BRAS能够快速接管用户业务，使得用户感知不到网络的故障，继续使用网络资源。如图1-10所示，两台BRAS分别旁挂到P路由器上，BRAS1和BRAS2相互热备，包括BAS的相互热备和NAT的相互热备，为整个网络实现如下功能：
提供家庭ADSL用户PPPOE拨号接入(包括IPv4和IPv6)认证计费，分配私网地址。当用户访问internet时，BRAS进行NAT转换。
提供小企业用户三层BAS接入的认证和计费，配置静态路由指向企业内部，并为企业访问internet提供NAT转换。
给IPTV用户提供DHCP Server，对下层PE Relay的STB DHCP请求，提供地址分配和认证。
图1-10 配置BAS叠加NAT双机热备组网图
表1-22 网络规划数据
配置思路
要求将下层用户的流量，尽量均匀的分布到两个BRAS上，因此需要进行BRAS1和BRAS2的相互热备。
BRAS1和BRAS2需要支持HA的相互热备，下层用户的上网流量，相对均匀地到两个BRAS进行NAT转换。正常情况下，下层用户BAS主用BRAS1时，NAT也主用BRAS1。
配置路由，使对于BRAS1 NAT主用的用户，其Internet回程流量按照IGW-P1–BRAS1的路径进行转发。
操作步骤
1. 配置BAS双机热备
# 配置BRAS1。
#
//配置地址池(ipv4_hsi_1在BRAS1上为主用，ipv4_hsi_2在BRAS1上为备用)
#
ip pool ipv4_hsi_1 baslocal
gateway 10.1.0.1 255.255.128.0
section 0 10.1.0.2 10.1.127.254
dns-server 172.16.3.3 192.168.8.8
#
ip pool ipv4_hsi_2 baslocal rui-slave
gateway 10.1.128.1 255.255.128.0
# LOCAL
section 0 10.1.128.2 10.1.255.254
# REMOTE
dns-server 172.16.3.3 192.168.8.8
#
//配置接口
#
interface LoopBack1
description for RUI
ip address 10.1.1.11 255.255.255.255
#
interface Eth-Trunk1
description to P1 Eth-trunk 11 for access
mode lacp-static
#
interfaceEth-Trunk1.4000
vlan-type dot1q 4000
description for BRAS RUI
ip address 10.0.253.2 255.255.255.248
vrrp vrid 3 virtual-ip 10.0.253.1
admin-vrrp vrid 3
vrrp vrid 3 priority 120
vrrp vrid 3 preempt-mode timer delay 120
vrrp vrid 3 track interface Eth-Trunk3.1 reduced50 //监视接口状态
vrrp vrid 3 track bfd-session 2 peer //监视BFD会话状态
vrrp vrid 3 track service-location 1 reduced50 //监视service-location备份组的状态
#
interface Eth-Trunk2
description to P1 Eth-trunk 12 for access
mode lacp-static
#
interface Eth-Trunk2.4000
vlan-type dot1q 4000
description for BRAS RUI
ip address 10.0.253.10 255.255.255.248
vrrp vrid 4 virtual-ip 10.0.253.9
admin-vrrp vrid 4
vrrp vrid 4 preempt-mode timer delay 120
vrrp vrid 4 track interface Eth-Trunk3.1reduced 50
vrrp vrid 4 track bfd-session 10 peer
vrrp vrid 4 track service-location 2 reduced50
#
interface Eth-Trunk4
description to BRAS2 Eth-trunk 4
ip address 10.1.1.1 255.255.255.248
#
//配置路由
#
ospf 1 router-id10.1.1.11
area 0.0.0.0
network 10.1.1.0 0.0.0.7
network 10.1.1.11 0.0.0.0
#
//配置BFD会话
#
bfd bras_rui_1 bindpeer-ip 10.0.253.3
discriminator local 2
discriminator remote 3
min-tx-interval 100
min-rx-interval 100
commit
#
bfd bras_rui_2 bindpeer-ip 10.0.253.11
discriminator local 10
discriminator remote 11
min-tx-interval 100
min-rx-interval 100
commit
#
//配置RBS和RBP
#
remote-backup-service s1
peer 10.1.1.12 source 10.1.1.11 port 2046
track interface Eth-Trunk3
protect redirect ip-nexthop 10.1.1.2 interfaceEth-Trunk4
ip-pool ipv4_hsi_1 metric 10 //配置地址池的cost值，主用的cost值较小
ip-pool ipv4_hsi_2 metric 20
#
remote-backup-profile p1
service-type bras
backup-id 10 remote-backup-service s1
peer-backup hot
vrrp-id 3 interface Eth-Trunk1.4000
nas logic-ip 10.51.250.250
#
remote-backup-profile p2
service-type bras
backup-id 20 remote-backup-service s1
peer-backup hot
vrrp-id 4 interface Eth-Trunk2.4000
nas logic-ip 10.51.250.250
#
//配置域
#
aaa
domain abc.com
authentication-scheme radius
accounting-scheme radius
ip-pool ipv4_hsi_1
ip-pool ipv4_hsi_2
dns primary-ip 172.16.3.3
dns second-ip 192.168.8.8
radius-server group aaa
trust upstream default
qos rate-limit-mode car inbound
qos rate-limit-mode car outbound
user-priority upstream trust-8021p-outer
#
//配置BAS接口
#
interface Eth-Trunk1.1
pppoe-server bind Virtual-Template 1
description for Home HSI user access 1
user-vlan 1001 1030 qinq 10
remote-backup-profile p1
bas
#
access-type layer2-subscriber default-domainauthentication abc.com
client-option82
option82-relay-mode dslam config-identify
ip-trigger
arp-trigger
#
#
interface Eth-Trunk2.1
pppoe-server bind Virtual-Template 1
description for home HSI user access 2
user-vlan 1031 1073 qinq 10
remote-backup-profile p2
bas
#
access-type layer2-subscriber default-domainauthentication abc.com
client-option82
option82-relay-mode dslam config-identify
ip-trigger
arp-trigger
#
#
# 配置BRAS2。
#
//配置地址池(ipv4_hsi_1在BRAS1上为主用，ipv4_hsi_2在BRAS1上为备用)
#
ip pool ipv4_hsi_1 bas localrui-slave
gateway 10.1.0.1 255.255.128.0
# LOCAL
section 0 10.1.0.2 10.1.127.254
# REMOTE
dns-server 172.16.3.3 192.168.8.8
#
ip pool ipv4_hsi_2 baslocal
gateway 10.1.128.1 255.255.128.0
section 0 10.1.128.2 10.1.255.254
dns-server 172.16.3.3 192.168.8.8
#
//配置接口
#
interface LoopBack1
description for RUI
ip address 10.1.1.12 255.255.255.255
#
interface Eth-Trunk1
description to P2 Eth-trunk 11 for access
mode lacp-static
#
interfaceEth-Trunk1.4000
vlan-type dot1q 4000
description for BRAS RUI
ip address 10.0.253.3 255.255.255.248
vrrp vrid 3 virtual-ip 10.0.253.1
admin-vrrp vrid 3
vrrp vrid 3 preempt-mode timer delay 120
vrrp vrid 3 track interface Eth-Trunk3.1reduced 50 //监视接口状态
vrrp vrid 3 track bfd-session 3 peer //监视BFD会话状态
vrrp vrid 3 track service-location 1 reduced50 //监视service-location备份组的状态
#
interface Eth-Trunk2
description to P2 Eth-trunk 12 for access
mode lacp-static
#
interfaceEth-Trunk2.4000
vlan-type dot1q 4000
description for BRAS RUI
ip address 10.0.253.11 255.255.255.248
vrrp vrid 4 virtual-ip 10.0.253.9
admin-vrrp vrid 4
vrrp vrid 4 priority 120
vrrp vrid 4 preempt-mode timer delay 120
vrrp vrid 4 track interface Eth-Trunk3.1reduced 50
vrrp vrid 4 track bfd-session 11 peer
vrrp vrid 4 track service-location 2 reduced50
#
interface Eth-Trunk4
description to BRAS1 Eth-trunk 4
ip address 10.1.1.2 255.255.255.248
#
//配置路由
#
ospf 1 router-id10.1.1.12
area 0.0.0.0
network 10.1.1.0 0.0.0.7
network 10.1.1.12 0.0.0.0
#
//配置BFD会话
#
bfd bras_rui_1 bindpeer-ip 10.0.253.2
discriminator local 3
discriminator remote 2
min-tx-interval 100
min-rx-interval 100
commit
#
bfd bras_rui_2 bindpeer-ip 10.0.253.10
discriminator local 11
discriminator remote 10
min-tx-interval 100
min-rx-interval 100
commit
#
//配置RBS和RBP
#
remote-backup-service s1
peer 10.1.1.11 source 10.1.1.12 port 2046
track interface Eth-Trunk3
protect redirect ip-nexthop 10.1.1.1 interfaceEth-Trunk4
ip-pool ipv4_hsi_1 metric 20 //配置地址池的cost值，主用的cost值较小
ip-pool ipv4_hsi_2 metric 10
#
remote-backup-profile p1
service-type bras
backup-id 10 remote-backup-service s1
peer-backup hot
vrrp-id 3 interface Eth-Trunk1.4000
nas logic-ip 10.51.250.250
#
remote-backup-profile p2
service-type bras
backup-id 20 remote-backup-service s1
peer-backup hot
vrrp-id 4 interface Eth-Trunk2.4000
nas logic-ip 10.51.250.250
#
//配置域
#
aaa
domain abc.com
authentication-scheme radius
accounting-scheme radius
ip-pool ipv4_hsi_1
ip-pool ipv4_hsi_2
dns primary-ip 172.16.3.3
dns second-ip 192.168.8.8
radius-server group aaa
trust upstream default
qos rate-limit-mode car inbound
qos rate-limit-mode car outbound
user-priority upstream trust-8021p-outer
#
//配置BAS接口
#
interface Eth-Trunk1.1
pppoe-server bind Virtual-Template 1
description for Home HSI user access 1
user-vlan 1001 1030 qinq 10
remote-backup-profile p1
bas
#
access-type layer2-subscriber default-domainauthentication abc.com
client-option82
option82-relay-mode dslam config-identify
ip-trigger
arp-trigger
#
#
interface Eth-Trunk2.1
pppoe-server bind Virtual-Template 1
description for home HSI user access 2
user-vlan 1031 1073 qinq 10
remote-backup-profile p2
bas
#
access-type layer2-subscriber default-domainauthentication abc.com
client-option82
option82-relay-mode dslam config-identify
ip-trigger
arp-trigger
#
#
2. 配置NAT双机热备
# 配置BRAS1。
#
//配置用户组
#
user-group hsi_1
user-group hsi_2
#
//配置ACL规则
#
acl number 3001
rule 5 permit ip source 10.1.0.0 0.0.255.255
rule 10 permit ip source 10.5.0.0 0.0.255.255
#
acl number 6001
rule 0 permit ip source user-group hsi_1
#
acl number 6002
rule 0 permit ip source user-group hsi_2
#
//配置流分类、NAT动作和NAT引流策略，并应用NAT引流策略
#
traffic classifierhsi_nat operator or
if-match acl 6001
traffic classifierhsi2_nat operator or
if-match acl 6002
#
traffic behavior hsi_nat
nat bind instance hsi
traffic behaviorhsi2_nat
nat bind instance hsi2
#
traffic policy hsi_nat
share-mode
classifier hsi_nat behavior hsi_nat
classifier hsi2_nat behavior hsi2_nat
#
traffic-policy hsi_natinbound
#
//配置接口
#
interface Eth-Trunk4
description to BRAS2 Eth-trunk 4
ip address 10.1.1.1 255.255.255.248
vrrp vrid 1 virtual-ip 10.1.1.3
admin-vrrp vrid 1 ignore-if-down
vrrp vrid 1 priority 120
vrrp vrid 1 preempt-mode timer delay 120
vrrp vrid 1 track interface Eth-Trunk3.1reduced 50
vrrp vrid 1 track service-location 1 reduced50
vrrp vrid 2 virtual-ip 10.1.1.4
admin-vrrp vrid 2 ignore-if-down
vrrp vrid 2 track service-location 2 reduced50
ospf cost 5
#
//配置HA热备份功能
#
service-ha hot-backupenable
#
service-location 1
location slot 8 engine 0
remote-backup interface Eth-Trunk4 peer10.1.1.2 //对端设备的IP地址必须是与BRAS2相连接口的IP地址
vrrp vrid 1 interface Eth-Trunk4
service-location 2
location slot 8 engine 0
remote-backup interface Eth-Trunk4 peer10.1.1.2 //对端设备的IP地址必须是与BRAS2相连接口的IP地址
vrrp vrid 2 interface Eth-Trunk4
#
service-instance-grouphsi
service-location 1
service-instance-grouphsi2
service-location 2
#
//配置NAT实例
#
nat instance hsi id 1
port-range 2048
service-instance-group hsi //绑定HA实例组
nat address-group 1 group-id 1
section 0 10.1.2.0 mask 23
nat outbound 3001 address-group 1
nat session-limit total 200
nat port-limit tcp 2048
nat port-limit udp 2048
nat alg all
nat filter mode full-cone
nat log session enable
nat instance hsi2 id 2
port-range 2048
service-instance-group hsi2
nat address-group 1 group-id 1
section 0 10.1.3.0 mask 23
nat outbound 3001 address-group 1
nat session-limit total 200
nat port-limit tcp 2048
nat port-limit udp 2048
nat alg all
nat filter mode full-cone
nat log session enable
#
//配置域，在域下将NAT实例和用户组绑定
#
aaa
domain abc.com
user-group hsi_1 bind nat instance hsi
user-group hsi_2 bind nat instance hsi2
#
# 配置BRAS2。
#
//配置用户组
#
user-group hsi_1
user-group hsi_2
#
//配置ACL规则
#
acl number 3001
rule 5 permit ip source 10.1.0.0 0.0.255.255
rule 10 permit ip source 10.5.0.0 0.0.255.255
#
acl number 6001
rule 0 permit ip source user-group hsi_1
#
acl number 6002
rule 0 permit ip source user-group hsi_2
#
//配置流分类、NAT动作和NAT引流策略，并应用NAT引流策略
#
traffic classifierhsi_nat operator or
if-match acl 6001
traffic classifierhsi2_nat operator or
if-match acl 6002
#
traffic behavior hsi_nat
nat bind instance hsi
traffic behaviorhsi2_nat
nat bind instance hsi2
#
traffic policy hsi_nat
share-mode
classifier hsi_nat behavior hsi_nat
classifier hsi2_nat behavior hsi2_nat
#
traffic-policy hsi_natinbound
#
//配置接口
#
interface Eth-Trunk4
description to BRAS1 Eth-trunk 4
ip address 10.1.1.2 255.255.255.248
vrrp vrid 1 virtual-ip 10.1.1.3
admin-vrrp vrid 1 ignore-if-down
vrrp vrid 1 track service-location 1 reduced50
vrrp vrid 2 virtual-ip 10.1.1.4
admin-vrrp vrid 2 ignore-if-down
vrrp vrid 2 priority 120
vrrp vrid 2 preempt-mode timer delay 120
vrrp vrid 2 track interface Eth-Trunk3.1reduced 50
vrrp vrid 2 track service-location 2 reduced50
ospf cost 5
#
//配置HA热备功能
#
service-ha hot-backupenable
#
service-location 1
location slot 8 engine 0
remote-backup interface Eth-Trunk4 peer10.1.1.1 //对端设备的IP地址必须是与BRAS1相连接口的IP地址
vrrp vrid 1 interface Eth-Trunk4
service-location 2
location slot 8 engine 0
remote-backup interface Eth-Trunk4 peer10.1.1.1 //对端设备的IP地址必须是与BRAS1相连接口的IP地址
vrrp vrid 2 interface Eth-Trunk4
#
service-instance-grouphsi
service-location 1
service-instance-grouphsi2
service-location 2
#
//配置NAT实例
#
nat instance hsi id 1
port-range 2048
service-instance-group hsi //绑定HA实例组
nat address-group 1 group-id 1
section 0 10.1.2.0 mask 23
nat outbound 3001 address-group 1
nat session-limit total 200
nat port-limit tcp 2048
nat port-limit udp 2048
nat alg all
nat filter mode full-cone
nat log session enable
nat instance hsi2 id 2
port-range 2048
service-instance-group hsi2
nat address-group 1 group-id 1
section 0 10.1.3.0 mask 23
nat outbound 3001 address-group 1
nat session-limit total 200
nat port-limit tcp 2048
nat port-limit udp 2048
nat alg all
nat filter mode full-cone
nat log session enable
#
//配置域，在域下将NAT实例和用户组绑定
#
aaa
domain abc.com
user-group hsi_1 bind nat instance hsi
user-group hsi_2 bind nat instance hsi2
#
3. 配置Internet路由
# 配置BRAS1
#
//配置接口
#
interface Eth-Trunk3
description to P1 Eth-trunk 13
#
interface Eth-Trunk3.1
vlan-type dot1q 1
description to eth-trunk13.1 for internet
ip address 10.1.1.21 255.255.255.252
#
interface Eth-Trunk4
description to BRAS2 Eth-trunk 4
ip address 10.1.1.1 255.255.255.248
ospf cost 5
#
//配置前缀列表
#
ip ip-prefix ipv4-hsiindex 10 permit 10.1.2.0 23 greater-equal 23 less-equal 32
ip ip-prefix ipv4-hsiindex 20 permit 10.1.3.0 23 greater-equal 23 less-equal 32
#
//配置路由策略
#
route-policy ipv4-hsipermit node 10
if-match ip-prefix ipv4-hsi
#
//使能自动控制路由cost优先级功能
#
peer-backup route-cost auto-advertising
#
//配置OSPF
#
ospf 1 router-id10.1.1.11
default cost inherit-metric
import-route unr type 1 route-policy ipv4-hsi
area 0.0.0.0
network 10.1.1.20 0.0.0.3
network 10.1.1.0 0.0.0.7
network 10.1.1.11 0.0.0.0
#
# 配置BRAS2
#
//配置接口
#
interface Eth-Trunk3
description to P2 Eth-trunk 13
#
interface Eth-Trunk3.1
vlan-type dot1q 1
description to eth-trunk13.1 for internet
ip address 10.1.1.31 255.255.255.252
#
interface Eth-Trunk4
description to BRAS2 Eth-trunk 4
ip address 10.1.1.2 255.255.255.248
ospf cost 5
#
//配置前缀列表
#
ip ip-prefix ipv4-hsiindex 10 permit 10.1.2.0 23 greater-equal 23 less-equal 32
ip ip-prefix ipv4-hsiindex 20 permit 10.1.3.0 23 greater-equal 23 less-equal 32
#
//配置路由策略
#
route-policy ipv4-hsipermit node 10
if-match ip-prefix ipv4-hsi
#
//使能自动控制路由cost优先级功能
#
peer-backup route-cost auto-advertising
#
//配置OSPF
#
ospf 1 router-id10.1.1.12
default cost inherit-metric
import-route unr type 1 route-policy ipv4-hsi
area 0.0.0.0
network 10.1.1.30 0.0.0.3
network 10.1.1.0 0.0.0.7
network 10.1.1.12 0.0.0.0
#
# 配置P1
#
//配置接口
#
interface Eth-Trunk13
description to BRAS1Eth-Trunk3
#
interface Eth-Trunk13.1
vlan-type dot1q 1
description toeth-trunk3.1 for internet
ip binding vpn-instanceHSI
ip address 10.1.1.22255.255.255.252
#
//配置OSPF
#
ospf 1 router-id 10.3.3.31vpn-instance HSI
description for HSI
default-route-advertisepermit-calculate-other
area 0.0.0.0
network 10.1.1.200.0.0.3
#
//配置前缀列表
#
ip ip-prefix BRAS1-HSIindex 10 permit 10.1.2.0 23 greater-equal 23 less-equal 32
ip ip-prefix BRAS2-HSIindex 10 permit 10.1.3.0 23 greater-equal 23 less-equal 32
ip ip-prefix defaultindex 10 permit 0.0.0.0 0
#
//配置路由策略
#
route-policy to_igwpermit node 10
if-match ip-prefixBRAS1-HSI
apply community 100:3000
#
route-policy to_igwpermit node 20
if-match ip-prefix BRAS2-HSI
apply community 100:3000
#
route-policy default_inpermit node 10
if-match ip-prefixdefault
#
//配置BGP
#
bgp 65002
#
ipv4-family vpn-instanceHSI
import-route ospf 1
peer 10.1.1.41 as-number100
peer 10.1.1.41description to IGW
peer 10.1.1.41route-policy default_in import
peer 10.1.1.41route-policy to_igw export
peer 10.1.1.41advertise-community
#
#
# 配置P2
#
//配置接口
#
interface Eth-Trunk13
description to BRAS2Eth-Trunk3
#
interface Eth-Trunk13.1
vlan-type dot1q 1
description toeth-trunk3.1 for internet
ip binding vpn-instanceHSI
ip address 10.1.1.32255.255.255.252
#
//配置OSPF
#
ospf 1 router-id10.3.3.32 vpn-instance HSI
description for HSI
default-route-advertisepermit-calculate-other
area 0.0.0.0
network 10.1.1.300.0.0.3
#
//配置前缀列表
#
ip ip-prefix BRAS1-HSIindex 10 permit 10.1.2.0 23 greater-equal 23 less-equal 32
ip ip-prefix BRAS2-HSIindex 10 permit 10.1.3.0 23 greater-equal 23 less-equal 32
ip ip-prefix defaultindex 10 permit 0.0.0.0 0
#
//配置路由策略
#
route-policy to_igwpermit node 10
if-match ip-prefixBRAS1-HSI
apply community 100:3000
#
route-policy to_igwpermit node 20
if-match ip-prefixBRAS2-HSI
apply community 100:3000
#
route-policy default_inpermit node 10
if-match ip-prefixdefault
#
//配置BGP
#
bgp 65002
#
ipv4-family vpn-instanceHSI
import-route ospf 1
peer 10.1.1.43 as-number100
peer 10.1.1.43description to IGW
peer 10.1.1.43route-policy default_in import
peer 10.1.1.43route-policy to_igw export
peer 10.1.1.43advertise-community
#
#
4. 验证配置结果
# BAS信息查看
执行命令displayaccess-user查看所有在线用户的信息。
执行命令displayaccess-user domain domain-name查看某个域下在线用户的信息。
执行命令displayaccess-user username username verbose查看某个用户的具体信息。
执行命令displaybackup-user [ user-id user-id | username user-name ]查看备份用户信息。
# NAT信息查看
执行命令display nat board-state查看NAT单板状态。
执行命令display natsession-table size查看当前为各个业务板分配的会话表资源。
执行命令display natsession aging-time查看NAT会话的老化时间。
执行命令display natstatistics查看NAT单板的各类应用统计信息。
执行命令display nataddress-usage查看地址池公网端口使用情况及使用率。
执行命令display natuser-information查看已上线的NAT用户信息，热备时两边BRAS信息相同。
执行命令display natsession table查看NAT会话表项。使用NAT热备时，两边BRAS能查看到相同的NAT表项。
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