配置L3VPN over IS-IS SR-MPLS BE示例
配置L3VPN,保证相同VPN用户之间的安全互访。
组网需求
CE1、CE2属于vpna。
vpna使用的VPN-target属性为111:1。
配置L3VPN迭代IS-IS SR-MPLS BE隧道,保证相同VPN用户之间的安全互访。同时由于公网PE之间存在多条链路,要求数据流量在公网能够进行负载分担。
配置思路
采用如下的思路配置L3VPN迭代IS-IS SR-MPLS BE隧道:
骨干网上配置IS-IS实现PE之间的互通。
骨干网上使能MPLS,配置Segment Routing,建立SR LSP。使能TI-LFA FRR。
PE上配置使能IPv4地址族VPN实例,并把与CE相连的接口和相应的VPN实例绑定。
PE之间配置MP-IBGP交换路由信息。
CE与PE之间配置EBGP交换路由信息。
操作步骤
- 配置接口的IP地址。
# 配置PE1。
<HUAWEI> system-view
[~HUAWEI] sysname PE1
[*HUAWEI] commit
[~PE1] interface loopback 1
[*PE1-LoopBack1] ip address 1.1.1.9 32
[*PE1-LoopBack1] quit
[*PE1] interface gigabitethernet0/1/0
[*PE1-GigabitEthernet0/1/0] ip address 172.3.1.1 24
[*PE1-GigabitEthernet0/1/0] quit
[*PE1] interface gigabitethernet0/3/0
[*PE1-GigabitEthernet0/3/0] ip address 172.1.1.1 24
[*PE1-GigabitEthernet0/3/0] quit
[*PE1] commit
# 配置P1。
<HUAWEI> system-view
[~HUAWEI] sysname P1
[*HUAWEI] commit
[~P1] interface loopback 1
[*P1-LoopBack1] ip address 2.2.2.9 32
[*P1-LoopBack1] quit
[*P1] interface gigabitethernet0/1/0
[*P1-GigabitEthernet0/1/0] ip address 172.1.1.2 24
[*P1-GigabitEthernet0/1/0] quit
[*P1] interface gigabitethernet0/2/0
[*P1-GigabitEthernet0/2/0] ip address 172.2.1.1 24
[*P1-GigabitEthernet0/2/0] quit
[*P1] commit
# 配置PE2。
<HUAWEI> system-view
[~HUAWEI] sysname PE2
[*HUAWEI] commit
[~PE2] interface loopback 1
[*PE2-LoopBack1] ip address 3.3.3.9 32
[*PE2-LoopBack1] quit
[*PE2] interface gigabitethernet0/1/0
[*PE2-GigabitEthernet0/1/0] ip address 172.4.1.2 24
[*PE2-GigabitEthernet0/1/0] quit
[*PE2] interface gigabitethernet0/3/0
[*PE2-GigabitEthernet0/3/0] ip address 172.2.1.2 24
[*PE2-GigabitEthernet0/3/0] quit
[*PE2] commit
# 配置P2。
<HUAWEI> system-view
[~HUAWEI] sysname P2
[*HUAWEI] commit
[~P2] interface loopback 1
[*P2-LoopBack1] ip address 4.4.4.9 32
[*P2-LoopBack1] quit
[*P2] interface gigabitethernet0/1/0
[*P2-GigabitEthernet0/1/0] ip address 172.3.1.2 24
[*P2-GigabitEthernet0/1/0] quit
[*P2] interface gigabitethernet0/2/0
[*P2-GigabitEthernet0/2/0] ip address 172.4.1.1 24
[*P2-GigabitEthernet0/2/0] quit
[*P2] commit
- 在骨干网上配置IGP协议,实现骨干网PE和P的互通。本例中以IS-IS为例进行说明。
# 配置PE1。
[~PE1] isis 1
[*PE1-isis-1] is-level level-1
[*PE1-isis-1] network-entity 10.0000.0000.0001.00
[*PE1-isis-1] quit
[*PE1] commit
[*PE1] interface loopback 1
[*PE1-LoopBack1] isis enable 1
[*PE1-LoopBack1] quit
[*PE1] interface gigabitethernet0/1/0
[*PE1-GigabitEthernet0/1/0] isis enable 1
[*PE1-GigabitEthernet0/1/0] quit
[*PE1] interface gigabitethernet0/3/0
[*PE1-GigabitEthernet0/3/0] isis enable 1
[*PE1-GigabitEthernet0/3/0] quit
[*PE1] commit
# 配置P1。
[~P1] isis 1
[*P1-isis-1] is-level level-1
[*P1-isis-1] network-entity 10.0000.0000.0002.00
[*P1-isis-1] quit
[*P1] commit
[~P1] interface loopback 1
[*P1-LoopBack1] isis enable 1
[*P1-LoopBack1] quit
[*P1] interface gigabitethernet0/1/0
[*P1-GigabitEthernet0/1/0] isis enable 1
[*P1-GigabitEthernet0/1/0] quit
[*P1] interface gigabitethernet0/2/0
[*P1-GigabitEthernet0/2/0] isis enable 1
[*P1-GigabitEthernet0/2/0] quit
[*P1] commit
# 配置PE2。
[~PE2] isis 1
[*PE2-isis-1] is-level level-1
[*PE2-isis-1] network-entity 10.0000.0000.0003.00
[*PE2-isis-1] quit
[*PE2] commit
[~PE2] interface loopback 1
[*PE2-LoopBack1] isis enable 1
[*PE2-LoopBack1] quit
[*PE2] interface gigabitethernet0/3/0
[*PE2-GigabitEthernet0/3/0] isis enable 1
[*PE2-GigabitEthernet0/3/0] quit
[*PE2] interface gigabitethernet0/1/0
[*PE2-GigabitEthernet0/1/0] isis enable 1
[*PE2-GigabitEthernet0/1/0] quit
[*PE2] commit
# 配置P2。
[~P2] isis 1
[*P2-isis-1] is-level level-1
[*P2-isis-1] network-entity 10.0000.0000.0004.00
[*P2-isis-1] quit
[*P2] commit
[~P2] interface loopback 1
[*P2-LoopBack1] isis enable 1
[*P2-LoopBack1] quit
[*P2] interface gigabitethernet0/1/0
[*P2-GigabitEthernet0/1/0] isis enable 1
[*P2-GigabitEthernet0/1/0] quit
[*P2] interface gigabitethernet0/2/0
[*P2-GigabitEthernet0/2/0] isis enable 1
[*P2-GigabitEthernet0/2/0] quit
[*P2] commit
- 在骨干网上配置MPLS基本能力
# 配置PE1。
[~PE1] mpls lsr-id 1.1.1.9
[*PE1] mpls
[*PE1-mpls] commit
[~PE1-mpls] quit
# 配置P1。
[~P1] mpls lsr-id 2.2.2.9
[*P1] mpls
[*P1-mpls] commit
[~P1-mpls] quit
# 配置PE2。
[~PE2] mpls lsr-id 3.3.3.9
[*PE2] mpls
[*PE2-mpls] commit
[~PE2-mpls] quit
# 配置P2。
[~P2] mpls lsr-id 4.4.4.9
[*P2] mpls
[*P2-mpls] commit
[~P2-mpls] quit
- 在骨干网上配置Segment Routing,同时使能TI-LFA FRR功能
# 配置PE1。
[~PE1] segment-routing
[*PE1-segment-routing] quit
[*PE1] commit
[~PE1] isis 1
[*PE1-isis-1] cost-style wide
[*PE1-isis-1] segment-routing mpls
[*PE1-isis-1] segment-routing global-block 16000 23999
SRGB取值范围动态变化,具体以设备的实际情况为准。此处仅做示例。
[*PE1-isis-1] frr
[*PE1-isis-1-frr] loop-free-alternate level-1
[*PE1-isis-1-frr] ti-lfa level-1
[*PE1-isis-1-frr] quit
[*PE1-isis-1] quit
[*PE1] interface loopback 1
[*PE1-LoopBack1] isis prefix-sid index 10
[*PE1-LoopBack1] quit
[*PE1] commit
# 配置P1。
[~P1] segment-routing
[*P1-segment-routing] quit
[*P1] commit
[~P1] isis 1
[*P1-isis-1] cost-style wide
[*P1-isis-1] segment-routing mpls
[*P1-isis-1] segment-routing global-block 16000 23999
SRGB取值范围动态变化,具体以设备的实际情况为准。此处仅做示例。
[*P1-isis-1] frr
[*P1-isis-1-frr] loop-free-alternate level-1
[*P1-isis-1-frr] ti-lfa level-1
[*P1-isis-1-frr] quit
[*P1-isis-1] quit
[*P1] interface loopback 1
[*P1-LoopBack1] isis prefix-sid index 20
[*P1-LoopBack1] quit
[*P1] commit
# 配置PE2。
[~PE2] segment-routing
[*PE2-segment-routing] quit
[*PE2] commit
[~PE2] isis 1
[*PE2-isis-1] cost-style wide
[*PE2-isis-1] segment-routing mpls
[*PE2-isis-1] segment-routing global-block 16000 23999
SRGB取值范围动态变化,具体以设备的实际情况为准。此处仅做示例。
[*PE2-isis-1] frr
[*PE2-isis-1-frr] loop-free-alternate level-1
[*PE2-isis-1-frr] ti-lfa level-1
[*PE2-isis-1-frr] quit
[*PE2-isis-1] quit
[*PE2] interface loopback 1
[*PE2-LoopBack1] isis prefix-sid index 30
[*PE2-LoopBack1] quit
[*PE2] commit
# 配置P2。
[~P2] segment-routing
[*P2-segment-routing] quit
[*P2] commit
[~P2] isis 1
[*P2-isis-1] cost-style wide
[*P2-isis-1] segment-routing mpls
[*P2-isis-1] segment-routing global-block 16000 23999
SRGB取值范围动态变化,具体以设备的实际情况为准。此处仅做示例。
[*P2-isis-1] frr
[*P2-isis-1-frr] loop-free-alternate level-1
[*P2-isis-1-frr] ti-lfa level-1
[*P2-isis-1-frr] quit
[*P2-isis-1] quit
[*P2] interface loopback 1
[*P2-LoopBack1] isis prefix-sid index 40
[*P2-LoopBack1] quit
[*P2] commit
# 配置完成后,在PE设备上执行display tunnel-info all命令,可以看到SR LSP已建立。以PE1的显示为例。
[~PE1] display tunnel-info all
Tunnel ID Type Destination Status ---------------------------------------------------------------------------------------- 0x000000002900000003 srbe-lsp 4.4.4.9 UP 0x000000002900000004 srbe-lsp 2.2.2.9 UP 0x000000002900000005 srbe-lsp 3.3.3.9 UP
# 在PE1上使用Ping检测SR LSP连通性,例如:
[~PE1] ping lsp segment-routing ip 3.3.3.9 32 version draft2
LSP PING FEC: SEGMENT ROUTING IPV4 PREFIX 3.3.3.9/32 : 100 data bytes, press CTRL_C to break Reply from 3.3.3.9: bytes=100 Sequence=1 time=12 ms Reply from 3.3.3.9: bytes=100 Sequence=2 time=5 ms Reply from 3.3.3.9: bytes=100 Sequence=3 time=5 ms Reply from 3.3.3.9: bytes=100 Sequence=4 time=5 ms Reply from 3.3.3.9: bytes=100 Sequence=5 time=5 ms --- FEC: SEGMENT ROUTING IPV4 PREFIX 3.3.3.9/32 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 5/6/12 ms
- 在PE之间建立MP-IBGP对等体关系
# 配置PE1。
[~PE1] bgp 100
[~PE1-bgp] peer 3.3.3.9 as-number 100
[*PE1-bgp] peer 3.3.3.9 connect-interface loopback 1
[*PE1-bgp] ipv4-family vpnv4
[*PE1-bgp-af-vpnv4] peer 3.3.3.9 enable
[*PE1-bgp-af-vpnv4] commit
[~PE1-bgp-af-vpnv4] quit
[~PE1-bgp] quit
# 配置PE2。
[~PE2] bgp 100
[~PE2-bgp] peer 1.1.1.9 as-number 100
[*PE2-bgp] peer 1.1.1.9 connect-interface loopback 1
[*PE2-bgp] ipv4-family vpnv4
[*PE2-bgp-af-vpnv4] peer 1.1.1.9 enable
[*PE2-bgp-af-vpnv4] commit
[~PE2-bgp-af-vpnv4] quit
[~PE2-bgp] quit
配置完成后,在PE设备上执行display bgp peer或display bgp vpnv4 all peer命令,可以看到PE之间的BGP对等体关系已建立,并达到Established状态。以PE1的显示为例。
[~PE1] display bgp peer
BGP local router ID : 1.1.1.9 Local AS number : 100 Total number of peers : 1 Peers in established state : 1 Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv 3.3.3.9 4 100 2 6 0 00:00:12 Established 0
[~PE1] display bgp vpnv4 all peer
BGP local router ID : 1.1.1.9 Local AS number : 100 Total number of peers : 1 Peers in established state : 1 Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv 3.3.3.9 4 100 12 18 0 00:09:38 Established 0
- 在PE设备上配置使能IPv4地址族的VPN实例,将CE接入PE
# 配置PE1。
[~PE1] ip vpn-instance vpna
[*PE1-vpn-instance-vpna] ipv4-family
[*PE1-vpn-instance-vpna-af-ipv4] route-distinguisher 100:1
[*PE1-vpn-instance-vpna-af-ipv4] vpn-target 111:1 both
[*PE1-vpn-instance-vpna-af-ipv4] quit
[*PE1-vpn-instance-vpna] quit
[*PE1] interface gigabitethernet0/1/0
[*PE1-GigabitEthernet0/1/0] ip binding vpn-instance vpna
[*PE1-GigabitEthernet0/1/0] ip address 10.1.1.2 24
[*PE1-GigabitEthernet0/1/0] quit
[*PE1] commit
# 配置PE2。
[~PE2] ip vpn-instance vpna
[*PE2-vpn-instance-vpna] ipv4-family
[*PE2-vpn-instance-vpna-af-ipv4] route-distinguisher 200:1
[*PE2-vpn-instance-vpna-af-ipv4] vpn-target 111:1 both
[*PE2-vpn-instance-vpna-af-ipv4] quit
[*PE2-vpn-instance-vpna] quit
[*PE2] interface gigabitethernet0/1/0
[*PE2-GigabitEthernet0/1/0] ip binding vpn-instance vpna
[*PE2-GigabitEthernet0/1/0] ip address 10.3.1.2 24
[*PE2-GigabitEthernet0/1/0] quit
[*PE2] commit
# 按图2-5配置各CE的接口IP地址,配置过程请参见后面的配置文件。
配置完成后,在PE设备上执行display ip vpn-instance verbose命令可以看到VPN实例的配置情况。各PE能ping通自己接入的CE。
当PE上有多个绑定了同一个VPN的接口,则使用ping -vpn-instance命令ping对端PE接入的CE时,要指定源IP地址,即要指定ping -vpn-instance vpn-instance-name -a source-ip-address dest-ip-address命令中的参数-a source-ip-address,否则可能ping不通。
- 在PE设备上配置隧道选择策略,优选SR LSP。
# 配置PE1。
[~PE1] tunnel-policy p1
[*PE1-tunnel-policy-p1] tunnel select-seq sr-lsp load-balance-number 2
[*PE1-tunnel-policy-p1] quit
[*PE1] commit
[~PE1] ip vpn-instance vpna
[*PE1-vpn-instance-vpna] ipv4-family
[*PE1-vpn-instance-vpna-af-ipv4] tnl-policy p1
[*PE1-vpn-instance-vpna-af-ipv4] quit
[*PE1-vpn-instance-vpna] quit
[*PE1] commit
# 配置PE2。
[~PE2] tunnel-policy p1
[*PE2-tunnel-policy-p1] tunnel select-seq sr-lsp load-balance-number 2
[*PE2-tunnel-policy-p1] quit
[*PE2] commit
[~PE2] ip vpn-instance vpna
[*PE2-vpn-instance-vpna] ipv4-family
[*PE2-vpn-instance-vpna-af-ipv4] tnl-policy p1
[*PE2-vpn-instance-vpna-af-ipv4] quit
[*PE2-vpn-instance-vpna] quit
[*PE2] commit
- 在PE与CE之间建立EBGP对等体关系
# 配置CE1。
[~CE1] interface loopback 1
[*CE1-LoopBack1] ip address 11.1.1.1 32
[*CE1-LoopBack1] quit
[*CE1] interface gigabitethernet0/1/0
[*CE1-GigabitEthernet0/1/0] ip address 10.1.1.1 24
[*CE1-GigabitEthernet0/1/0] quit
[*CE1] bgp 65410
[*CE1-bgp] peer 10.1.1.2 as-number 100
[*CE1-bgp] network 11.1.1.1 32
[*CE1-bgp] quit
[*CE1] commit
CE2的配置与CE1设备配置类似,配置过程请参见后面的配置文件。
# 配置PE1。
[~PE1] bgp 100
[*PE1-bgp] ipv4-family vpn-instance vpna
[*PE1-bgp-vpna] peer 10.1.1.1 as-number 65410
[*PE1-bgp-vpna] commit
[*PE1-bgp-vpna] quit
PE2的配置与PE1类似,配置过程请参见后面的配置文件。
配置完成后,在PE设备上执行display bgp vpnv4 vpn-instance peer命令,可以看到PE与CE之间的BGP对等体关系已建立,并达到Established状态。
以PE1与CE1的对等体关系为例:
[~PE1] display bgp vpnv4 vpn-instance vpna peer
BGP local router ID : 1.1.1.9 Local AS number : 100 VPN-Instance vpna, Router ID 1.1.1.9: Total number of peers : 1 Peers in established state : 1 Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv 10.1.1.1 4 65410 11 9 0 00:06:37 Established 1
- 检查配置结果
在PE设备上执行display ip routing-table vpn-instance命令,可以看到去往CE上的Loopback接口路由。
以PE1的显示为例:
[~PE1] display ip routing-table vpn-instance vpna
Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Tables: vpna Destinations : 7 Routes : 7 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.2 GigabitEthernet0/1/0 10.1.1.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/1/0 10.1.1.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/1/0 11.1.1.1/32 EBGP 255 0 RD 10.1.1.1 GigabitEthernet0/1/0 22.2.2.2/32 IBGP 255 0 RD 3.3.3.9 GigabitEthernet0/1/0 IBGP 255 0 RD 3.3.3.9 GigabitEthernet0/3/0 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
同一VPN的CE能够相互Ping通,例如:CE1能够Ping通CE2(22.2.2.2)。
[~CE1] ping -a 11.1.1.1 22.2.2.2
PING 22.2.2.2: 56 data bytes, press CTRL_C to break Reply from 22.2.2.2: bytes=56 Sequence=1 ttl=251 time=72 ms Reply from 22.2.2.2: bytes=56 Sequence=2 ttl=251 time=34 ms Reply from 22.2.2.2: bytes=56 Sequence=3 ttl=251 time=50 ms Reply from 22.2.2.2: bytes=56 Sequence=4 ttl=251 time=50 ms Reply from 22.2.2.2: bytes=56 Sequence=5 ttl=251 time=34 ms --- 22.2.2.2 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 34/48/72 ms
配置文件
PE1的配置文件
# sysname PE1 # ip vpn-instance vpna ipv4-family route-distinguisher 100:1 tnl-policy policy1 vpn-target 111:1 export-extcommunity vpn-target 111:1 import-extcommunity # mpls lsr-id 1.1.1.9 # mpls # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0001.00 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-1 ti-lfa level-1 # interface GigabitEthernet0/1/0 undo shutdown ip address 172.3.1.1 255.255.255.0 isis enable 1 # interface GigabitEthernet0/2/0 undo shutdown ip binding vpn-instance vpna ip address 10.1.1.2 255.255.255.0 # interface GigabitEthernet0/3/0 undo shutdown ip address 172.1.1.1 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 1.1.1.9 255.255.255.255 isis enable 1 isis prefix-sid index 10 # bgp 100 peer 3.3.3.9 as-number 100 peer 3.3.3.9 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 3.3.3.9 enable # ipv4-family vpnv4 policy vpn-target peer 3.3.3.9 enable # ipv4-family vpn-instance vpna peer 10.1.1.1 as-number 65410 # tunnel-policy policy1 tunnel select-seq sr-lsp load-balance-number 2 # return
P1的配置文件
# sysname P1 # mpls lsr-id 2.2.2.9 # mpls # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0002.00 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-1 ti-lfa level-1 # interface GigabitEthernet0/1/0 undo shutdown ip address 172.1.1.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/2/0 undo shutdown ip address 172.2.1.1 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 2.2.2.9 255.255.255.255 isis enable 1 isis prefix-sid index 20 # return
PE2的配置文件
# sysname PE2 # ip vpn-instance vpna ipv4-family route-distinguisher 200:1 tnl-policy policy1 vpn-target 111:1 export-extcommunity vpn-target 111:1 import-extcommunity # mpls lsr-id 3.3.3.9 # mpls # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0003.00 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-1 ti-lfa level-1 # interface GigabitEthernet0/1/0 undo shutdown ip address 172.4.1.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/2/0 undo shutdown ip binding vpn-instance vpna ip address 10.2.1.2 255.255.255.0 # interface GigabitEthernet0/3/0 undo shutdown ip address 172.2.1.2 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 3.3.3.9 255.255.255.255 isis enable 1 isis prefix-sid index 30 # bgp 100 peer 1.1.1.9 as-number 100 peer 1.1.1.9 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 1.1.1.9 enable # ipv4-family vpnv4 policy vpn-target peer 1.1.1.9 enable # ipv4-family vpn-instance vpna peer 10.2.1.1 as-number 65420 # tunnel-policy policy1 tunnel select-seq sr-lsp load-balance-number 2 # return
P2的配置文件
# sysname P2 # mpls lsr-id 4.4.4.9 # mpls # segment-routing # isis 1 is-level level-1 cost-style wide network-entity 10.0000.0000.0004.00 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-1 ti-lfa level-1 # interface GigabitEthernet0/1/0 undo shutdown ip address 172.3.1.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/2/0 undo shutdown ip address 172.4.1.1 255.255.255.0 isis enable 1 # interface LoopBack1 ip address 4.4.4.9 255.255.255.255 isis enable 1 isis prefix-sid index 40 # return
CE1的配置文件
# sysname CE1 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.1.1.1 255.255.255.0 # interface LoopBack1 ip address 11.1.1.1 255.255.255.255 # bgp 65410 peer 10.1.1.2 as-number 100 network 11.1.1.1 255.255.255.255 # ipv4-family unicast peer 10.1.1.2 enable # return
CE2的配置文件
# sysname CE2 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.2.1.1 255.255.255.0 # interface LoopBack1 ip address 22.2.2.2 255.255.255.255 # bgp 65420 peer 10.2.1.2 as-number 100 network 22.2.2.2 255.255.255.255 # ipv4-family unicast peer 10.2.1.2 enable # return