d****i
发帖数: 1038 | 1 But I think if you want to set up l2vpn, you cannot use the following BGP
method to distribute the labels. The PE-agg-1/2 config you mentioned is for
l2vpn which in IOS you can only use LDP to distribute the label.
send-
to |
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s*****g
发帖数: 1055 | 2 Since when IOS started supporting BGP signaling for L2VPN? I had the
impression that BGP is used only for auto-discovery in IOS. |
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s*****g
发帖数: 1055 | 3 That is for L3VPN inter-AS, has nothing to do with L2VPN (VPLS)'s BGP
signalling. |
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z**r
发帖数: 17771 | 4 right, again the BGP I was mentioning is NOT the BGP for discovring the
neighbors in L2VPN, I was talking about how the ASBR's distribute labels
between AS's. The link I posted was just for clarifying the purpose of send-
label command. My understanding is, send-label is just for exchanging ipv4
and labels with peer without enabling ldp on the ASBR's, it doesn't have to
be inter provider l3vpn right?
see the PE-agg-1/2 config at
http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fsstitch.ht |
|
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z**r
发帖数: 17771 | 6 why? the igp label distribution should be the same bah? I made the send-
label method work for inter-as l2vpn, and at the same time, the inter-as
l3vpn works fine too. the ebgp between ASBR's should do the same job
for |
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d****i
发帖数: 1038 | 7 I have some questions. When you tried the l2vpn, did you implement Option A
or Option C? In Option C, how did you distribute the label between PE and
ASBR? LDP? How the end to end LSP was setup?
BTW, Option B is not fully supported in Cisco yet. |
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s*******8
发帖数: 12734 | 8 整个中间就是一个switch，我也不知道为什么搞这么复杂，
直接设置VLAN不好么？port #现在一般switch也够。
L2VPN优势在哪里？any comments?
也许小弟理解的不对，还请赐教。 |
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v**n
发帖数: 951 | 9 如果就一个switch就不知道wsm了
如果中间有多个router,搞不好还要经过公网，那L2VPN还是挺靠谱的。 |
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s*******8
发帖数: 12734 | 10 L2VPN是under same subnet的，你说的senario是layer 3 VPN。 |
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z**r
发帖数: 17771 | 11 L2VPN can be based on MPLS or L2TPv3 or even GRE, anyway, this does require
the core to support additions. But, which core doesn't support these now?
The only exception that I can think of is, the DCI needs to be across
multiple service providers, which would need inter-as l2vpn and make the
implementation more complicated
So, let's assume the core is l2vpn capable already, then otv or l2vpn? |
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z**r
发帖数: 17771 | 12 不带这样开玩笑的啊，厚厚
不过这个的确现在是个问题了，最初因为只有L3VPN，所以大家叫MPLS VPN的时候，自
然是指MPLS L3VPN，现在L2VPN也有了，所以MPLS VPN还真不是一个好叫法了，除非想
用MPLS VPN代表L3VPN and L2VPN(AToM) |
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z**r
发帖数: 17771 | 13 AToM主要用来和基于L2TPv3等tunnel的L2VPN区分的吧？如果说MPLS L2VPN俺觉得就应
该是AToM
belong to MPLS L2 VPN category, Cisco seems to differentiate among EoMPLS,
VPLS, and AToM which specifically refers to PPP/HDLC/ATM/FR over MPLS. |
|
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s******v
发帖数: 4495 | 15 试着回答一下问题，
1)对于e2e backhaul nework (中间有多个独立carrier network), 和多个cell site
cluster (可以看成是VPN 或VLAN clusters）， 我们如何支持高效traffic routing
和 VLAN management? 用什么方法或协议？
vpls l2vpn应该可以，不过inter AS l2vpn vpls目前，应该只有option C，option B
应该刚出来，而且不是所有的ISP都支持。
2）carrier 数量有限，并且是WAN结构，我感觉MPLS labeling 可以用在两个carrier
之间fast switching, 但我不能确定如何cell cluster中routing traffic, 比如从
hub
cell 到
a end cell site. 用IP subnet? or still MPLS label (但是有overhead
cost), 还
是其他好方法？
我觉得ip subnet最简单，still mpls label什么意思，难道你自己也要跑mpls?
3... 阅读全帖 |
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L******t
发帖数: 1985 | 16 OTV and l2vpn are pretty much interchangeable usage wise. L2vpn is usually
VPLS based on MPLS infra (even though theoretically VPLS does not have to),
but OTV is only based on vanilla IP infra. |
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s*****g
发帖数: 1055 | 17 Let me try to answer your questions, there are two types of MPLS VPNs, MPLS
L2VPN and MPLS L3VPN, MPLS L3VPN is standardized in well known RFC2547,
payload is IP, MPLS L2VPN is a general term for (Cisco)AToM, EoMPLS and
VPLS, payload is FR/HDLC but more commonly Ethernet/Ethernet VLAN.
ISPs need to run IGP in their own internal network, because MPLS LSPs are
typically among iBGP loopbacks, iBGP has to be on top of TCP/IP, of course
you can have MPLS LSPs that are purely used to transport IP tra... 阅读全帖 |
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c*******n
发帖数: 112 | 18 In this case, you need to know how VRF is operated in a network, e.g, BGP,
RT, RD. I guess this is not very easy to describe in a interview. I do not
think this is a good interview question.
Since the question is related to TCP/IP, I assume it is L3VPN, not L2VPN. |
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b******l
发帖数: 860 | 19 lz跟我同行啊，要能remote的话把我招了吧:). Cisco ASA / Juniper SRX我都熟，
L2vpn能现场配通不在话下，呵呵。
t
this.
role |
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b******e
发帖数: 66 | 20 VPLS has heavy overhead? in terms of control plane? it is a natural
extension of p2p draft-martini if LDP is used for signaling, or natural
extension of 2547bis if BGP is used for signaling. in terms of transport?
all L2VPN (Ethernet/ATM/FR etc) over MPLS (or L2TP) have the same overhead.
Only market decides the techonology is stupid or not. Most major equipment
vendors support VPLS, obviously there is strong demand for this technology.
VPLS does have its problems (scaling/standard resource dis |
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w***s
发帖数: 321 | 21 印象中L3VPN over L2TPv3是ATT点的，据说他们很讨厌MPLS，另外L2VPN over L2TPv3
是直接了当的，不像L3的配置有些怪异。
edge |
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z**r
发帖数: 17771 | 22 应该是Sprint点的，Sprint的Peerless IP backbone就是采用的MPLS VPN over L2TPv3
，2003年左右的事情了。L2VPN over L2TPv3的配置比较hierarchical一些，是相对
make more sense
L2TPv3 |
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w***s
发帖数: 321 | 23 史前文明的时候有个协议叫UTI，用两块E2卡，其中一块专职做Tunnel encap.
后来MPLS L2VPN在E2上也是类似的实现。 |
|
d****i
发帖数: 1038 | 24 在l2vpn的各种实现中，总要特别考虑进去对stp的支持，烦。
people
run
voice |
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z**r
发帖数: 17771 | 25 any document about this? I tried option B and C, but B failed |
|
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z**r
发帖数: 17771 | 27 确实差不多，为啥叫pseudowire switching呢？跟俺昨天的实现差不多，都是在ASBR上
用mp-bgp send-label。 |
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d****i
发帖数: 1038 | 28 You are right. IOS will never support BGP-VPLS. But I heard IOS-XR will
support BGP-VPLS. |
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d****i
发帖数: 1038 | 29 IOS 不是用bgp send label， 只用bgp find neighbor. |
|
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c*****i
发帖数: 631 | 31 ios only support lsp signalling. xr will support bgp-vpls in next release. |
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s*****g
发帖数: 1055 | 32 Lao Da, that is for VPLS neighbor auto-discovery, not signalling. |
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d****i
发帖数: 1038 | 33 Mostly for business and political reasons, partly for belief and technical
reasons, :) IOS won't be allowed to support BGP-VPLS. but IOS-XR decided to
go ahead to support it to counter some of the Juniper efforts. :)
on |
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c*****i
发帖数: 631 | 34 confused.. you are trying to use ldp signaling or bgp-vpls autodiscovery/
signaling? |
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w***s
发帖数: 321 | 35 因为Pseduowire在ASBR上终结了。你是咋搞？将PE的loopback互传？ |
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d****i
发帖数: 1038 | 36 ah, I think you used the bgp send-label command for pseudowire-switching,
which actually is stitching two pw together. the send-label command is used
to set up a lsp between the two ASBR, isn't it? |
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z**r
发帖数: 17771 | 37 let me reproduce the scenarios some later, maybe your are right
used |
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z**r
发帖数: 17771 | 38 Option C. LDP. I don't remember the details for the 3rd question now, let me
re run the test some time later
A |
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c*****i
发帖数: 631 | 39 l2vpn有基于mpls和l2tpv3的。然后又分vpws和vpls。signalling方面又有ldp和bgp。
然后又有bgp auto discover+ldp或者bgp singalling。
, |
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m******t
发帖数: 4077 | 40 顶， 这个基本上cisco l2vpn的定义了， 尤其是XR platform上的。 |
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z**r
发帖数: 17771 | 41 mpls label switching最大的误解之一就是mpls switching快。其实你想，不管mpls
label forwarding or IP forwarding，在跑mpls的cisco router上，都是cef
switching，也就是说速度是一样的。
mpls最大的优势在于用单一的平台提供各种mpls application， 比如l3vpn, l2vpn,
TE, FRR, etc. |
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z**r
发帖数: 17771 | 42
这个不能算不用BGP的理由吧
run
俺认为很多情况下PE是MSE，既要提供L3VPN也要提供L2VPN，至少也应该capable of
doing that |
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m********d
发帖数: 188 | 43 来自主题: EmergingNetworking版 - L2TP协议
lt2pv3是很实用的技术，很多用处。可以代替mpls作为l2vpn的transport layer, 可以再
internet上做出一条高性能的tunnel（几个Gbps ）。 |
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z**r
发帖数: 17771 | 44 来自主题: EmergingNetworking版 - L2TP协议 大规模应用的可能就sprint一家，这个东西是可以和mpls互补，不过如果有了mpls，也
的确没有必要上两套transport。不光l2vpn，l3vpn也可以
以再 |
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s*****g
发帖数: 1055 | 45 来自主题: EmergingNetworking版 - L2TP协议 L2TP PW based VPN is not only used by SPs, enterprises use L2TP to establish
L2VPN too, one application of this configuration is vMotion which requires
two hosts are in the same VLAN. |
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m********d
发帖数: 188 | 46 对不起，非高手又出来了。看着好像是个挺有意思的问题，可是实在是有好几个“术语
”看不懂，
但是再问关于问题的问题又太搞笑，干脆算了，就失去这次学习的机会吧。
中间那几个互相独立的网络能做出一条l2vpn连接hub和msc呢？还是不十分懂你的问题
。例如
你这儿的vlan management指得是什么？好像你的senario描述觉得勉强看懂了，但后面的
3个问题一个都没看懂，真是失败啊。 |
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s******v
发帖数: 4495 | 47 backhaul不是太明白，我看我理解的对不对
ce1 --- peA (as 1) -- ..inter-isp cloud.. --- peB (as 2) --- ce 2
1) ce1 = hub base station router, 有自己的vlan, 例如100, 还有多个lan，每个
对应一个leaf base station;
2) ce2 = att msc， 这边是什么，ip? 还是vlan trunk?
感觉inter as l2vpn vpls是可以的，不过要两个isp都support，有点复杂。
最好还是 mpls l3vpn, 每个基站给个/24 network, peA - ce1 and peB - ce2用
ebgp，中间是 inter as opt b/c，不过这个isp的事。
于距离
MSC),
site |
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t*******r
发帖数: 3271 | 48 你觉得你能一根儿光纤从西海岸一台switch直接接到东海岸一台switch么?
你要觉得能,那就当我白说~ |
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s*****g
发帖数: 1055 | 49 Hehehe, what? ;-)
Technically you can have a fiber connection between two switches in two
coasts, question you should ask is how scalable is this solution? and what is the cost of this solution? |
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t*******r
发帖数: 3271 | 50 不嫌贵~
is the
cost of this solution? |
|
