我需要在 IOS-XE 设备 (ASR903) 和瞻博网络 MX480 之间使用双栈 OSPFv3 在 IGP 链路上实现 BFD。
我正在 IOS-XE 和 IOS-XE 之间的许多链路上为双栈 OSPFv3 成员运行 BFD，但第一次需要将它实施到 Junos 设备。
这是我的配置（目前在 ASR920 和 MX104 的测试环境中）：
IOS-XE：
interface GigabitEthernet0/0/4
mtu 9000
ip address 10.100.100.2 255.255.255.252
ip mtu 1500
media-type rj45
speed 1000
no negotiation auto
ipv6 enable
ipv6 mtu 1500
ospfv3 1 ipv6 area 0
ospfv3 1 ipv4 area 0
bfd interval 1000 min_rx 1000 multiplier 5
router ospfv3 1
router-id 10.100.100.2
bfd all-interfaces
!
address-family ipv4 unicast
area 0 range 10.100.100.0 255.255.255.252
exit-address-family
!
address-family ipv6 unicast
exit-address-family
君操作系统：
aschaefer@IE1-FD1_re0# show
instance-type virtual-router;
interface ge-0/1/0.0;
protocols {
ospf3 {
realm ipv4-unicast {
area 0.0.0.0 {
interface ge-0/1/0.0 {
bfd-liveness-detection {
minimum-receive-interval 1000;
multiplier 5;
transmit-interval {
minimum-interval 1000;
}
}
}
}
}
area 0.0.0.0 {
interface ge-0/1/0.0 {
bfd-liveness-detection {
minimum-receive-interval 1000;
multiplier 5;
transmit-interval {
minimum-interval 1000;
}
}
}
}
}
}
在IOS XE Box上，BFD for IPv6邻居是Up的，但在IPv4邻居之间没有。我没有看到任何从瞻博网络发送到思科设备的 Rx BFD 数据包。
PE3-FD1#sh bfd neighbors details
IPv4 Sessions
NeighAddr LD/RD RH/RS State Int
10.100.100.1 2/0 Down Down Gi0/0/4
Session Host: Hardware
OurAddr: 10.100.100.2
Handle: 2
Local Diag: 0, Demand mode: 0, Poll bit: 0
MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 5
Received MinRxInt: 0, Received Multiplier: 0
Holddown (hits): 0(0), Hello (hits): 1000(0)
Rx Count: 0 <<<<<<<<<<<<<<<<< No BFD from IPV4 neighbor
Tx Count: 1576
Elapsed time watermarks: 0 0 (last: 0)
Registered protocols: OSPFv3 CEF
Last packet: Version: 1 - Diagnostic: 0
State bit: AdminDown - Demand bit: 0
Poll bit: 0 - Final bit: 0
C bit: 0
Multiplier: 0 - Length: 0
My Discr.: 0 - Your Discr.: 0
Min tx interval: 0 - Min rx interval: 0
Min Echo interval: 0
IPv6 Sessions
NeighAddr LD/RD RH/RS State Int
FE80::6664:9BFF:FED0:18A9 1/19 Up Up Gi0/0/4
Session state is UP and not using echo function.
Session Host: Hardware
OurAddr: FE80::A66C:2AFF:FE24:5004
Handle: 1
Local Diag: 0, Demand mode: 0, Poll bit: 0
MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 5
Received MinRxInt: 1000000, Received Multiplier: 5
Holddown (hits): 0(0), Hello (hits): 1000(0)
Rx Count: 1256
Tx Count: 1576
Elapsed time watermarks: 0 0 (last: 0)
Registered protocols: OSPFv3 CEF
Uptime: 00:18:30
Last packet: Version: 1 - Diagnostic: 0
State bit: Up - Demand bit: 0
Poll bit: 0 - Final bit: 0
C bit: 0
Multiplier: 5 - Length: 24
My Discr.: 19 - Your Discr.: 1
Min tx interval: 1000000 - Min rx interval: 1000000
Min Echo interval: 0
在 JunOS Box 上看起来不错：
IE1-FD1_re0> show bfd session detail
Detect Transmit
Address State Interface Time Interval Multiplier
fe80::a66c:2aff:fe24:5004 Up ge-0/1/0.0 5.000 1.000 5
Client OSPF realm ipv6-unicast Area 0.0.0.0, TX interval 1.000, RX interval 1.000
Client OSPF realm ipv4-unicast Area 0.0.0.0, TX interval 1.000, RX interval 1.000
Session up time 00:23:25
Local diagnostic None, remote diagnostic None
Remote state Up, version 1
Replicated
Session type: Single hop BFD
我认为问题在于 JunOS 和 IOS-XE 正在以两种不同的方式处理 OSPFv3 的 BFD。虽然 IOS-XE 将 IPv4 和 IPv6 视为两个不同的邻居，并建立两个单独的 BFD 会话，但 Junos 正在处理 IPv6 和 IPv4 OSPF 邻居的 BFD，只是在单个 IPv6 BFD 会话的“顶部”（对不起，我在这里的英语不好）
是否有任何建议如何配置它？
最好的问候安德烈亚斯