s*****g
发帖数: 1055 | 1 Why in interAS scenario, BGP is better than LDP? as far as VPLS is concerned
, it should not care about BGP/ASBR etc, only it needs is MPLS
transportation to remote PEs, and LDP session to remote PEs to exchange L2
FECs.The issue that how to signal MPLS LSP over AS boundary is irrelevant to VPLS signaling.
I thought only Juniper is sticking to BGP VPLS, while the rest of world uses
LDP VPLS and use BGP for auto-discovery.
One obvious advantage of BGP-VPLS is that BGP has router-reflector concept... 阅读全帖 |
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d****i
发帖数: 1038 | 2 thanks for sharing your view.
but this should not be the reason not using it. :)
yes, it is really odd that in H-VPLS case, the upe to npe is running ldp,
but npes are running BGP. actually I am not sure how that could be
configured, especially on the npe. I am not sure how Juniper and XR support H-VPLS.
I heard there are proposals for using bgp in vpws case. If that's true, can we
use BGP to replace ldp? :)
run
But in the interAS case, BGP is needed between the two ASBR, and probably
there won... 阅读全帖 |
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d****i
发帖数: 1038 | 3 I think ldp-vpls's answer to the scale issue is H-VPLS. And H-VPLS has
advantage in mac-learning and withdraw compared to bgp-vpls. the RR solution
in bgp-vpls still has to flood mac withdraw to every pe, and each pe still
will keep the macs of every other PE. |
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b******e
发帖数: 66 | 4 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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d****i
发帖数: 1038 | 5 cisco IOS 长期不支持 vpls using bgp as signaling， 这里面当然有与juniper别苗
头的意思，
尤其是 Lucas Martini很不喜欢bgp vpls， 但是比较这两者，从技术上说，各有什么
优劣呢？ |
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s*****g
发帖数: 1055 | 6 1) BGP is doing too much already
2) LDP signaling for VPLS is a natural evolution from point-to-point L2
service signaling, why introduce an totally different protocol for
multipoint?
3) LDP is probably un-avoidable in the network to provide MPLS
transportation, but is it always true that a VPLS PE router also always run
BGP? I think not. |
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d****i
发帖数: 1038 | 7 客户为什么会specially 需要bgp vpls 呢？从大家的讨论看，那个RR feature可能是
一个重要原因吧。不过也可能是vendor忽悠的结果。 客户也未必真需要，但是你有他
没有，客户自然就要两者都有的了，多一种选择么。
IOS 因为不支持bgp vpls，最近很多招标直接出局了。 |
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w*******y
发帖数: 60932 | 8 Dell Home
Sony VPL-BW7 LCD Home Theater Projector
$900 - $500 Instant Savings
= $400 ($388 w/ DPA) + Free Shipping
View your favorite TV programming, play videogames, or watch the big game
with Sony VPL-BW7 LCD Home Theater Projector. Sporting 3LCD panel technology
, 720p HD resolution, an output of 2,000 lumens, and a contrast ratio of up
to 1,000:1, the VPL-BW7 projector delivers outstanding image quality and
color. Built-in noise reduction reduces unwanted picture artifacts giving
you a more |
|
w*******y
发帖数: 60932 | 9 Dell Home
Sony VPL-BW7 LCD Home Theater Projector
$900 - $500 Instant Savings
= $400 ($388 w/ DPA) + Free Shipping
View your favorite TV programming, play videogames, or watch the big game
with Sony VPL-BW7 LCD Home Theater Projector. Sporting 3LCD panel technology
, 720p HD resolution, an output of 2,000 lumens, and a contrast ratio of up
to 1,000:1, the VPL-BW7 projector delivers outstanding image quality and
color. Built-in noise reduction reduces unwanted picture artifacts giving
you a more |
|
d****i
发帖数: 1038 | 10 ft, one of the reasons IOS rejected bgp vpls was not to give Juniper a
chance to crack the ATT market. :)
Juniper finally supported both, so this reason does not exist any more. |
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d****i
发帖数: 1038 | 11 这些都是XR的平台。
IOS 加bgp vpls还没影儿呢。 |
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d****i
发帖数: 1038 | 12 7600， ASR1k, cat6k 等等。
SP 方面aggregation, pre-aggregation的platform主要都是IOS的。
所以，不支持bgp-vpls对IOS的business有影响。 |
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z**r
发帖数: 17771 | 13 H-VPLS和RR相比还是不是一个级别的吧，只能算agg router
solution
still |
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d****i
发帖数: 1038 | 14 Can VC types in a VPLS different? Say in a single VPLS instance (a VFI in
cisco world), can some VC be type 4,
others be type 5? Is this allowed/disallowed by some RFC? |
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r*******u
发帖数: 8732 | 15 Long time no go to the library.
A friend reminded me to see "Sin City" , and it can be borrowed at the VPL. |
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I*****s
发帖数: 3995 | 16 【 以下文字转载自 HiFi 讨论区 】
发信人: IamIris (顺其自然), 信区: HiFi
标 题: Sony VPL-BW7 LCD Home Theater Projector $450
发信站: BBS 未名空间站 (Fri Oct 29 14:57:44 2010, 美东)
就是一般的看看电影，这个牌子价位好吗？在线等，谢谢！ |
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z**r
发帖数: 17771 | 17 I have a topology like
CE1----dot1q-----PE1-------MPLS cloud-------------PE2-----dot1q--------CE2
PEs run VPLS over LDP. CE1 is sending dot1q traffic with COS value 2, on the
PE1, I rewrite the MPLS EXP bit to 4 when matching COS 2. So on the CE2, what
COS value am I supposed to see? |
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L******t
发帖数: 1985 | 18 Why VPLS stupid? What's PW? |
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z**r
发帖数: 17771 | 19 PW: Pseudo Wire :)
主要是VPLS overhead太重，而且在21世纪非要实现一个1980年代的网络，虽然是一个
virtual的。
俺觉得他说的很有道理，人们费了多大劲才把网络弄到现在这个水平，结果又弄回去了
，有点自虐的意思 |
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d****i
发帖数: 1038 | 20 就是这个上面的：
http://www.cisco.com/en/US/docs/routers/7600/install_config/12.2SX_OSM_config/mpls.html#wp1338115
Figure 1-6.
PE3 和upe之间的连接：
interface Vlan 1001
xconnect vfi Internet
这个vlan1001 没有像PE3和CE3这样:
interface GigEthernet6/1
switchport
switchport mode trunk
switchport trunk encap dot1q
switchport trunk allow vlan 211
interface Vlan 1001
xconnect vfi Internet
interface Vlan 211
xconnect vfi PE3-VPLS-A
那么vlan 1001 是怎么从access-facing interface 得到来自upe3的pw packets的呢？
换言之，在这个例子中，pe3和upe3之间的interface |
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z**r
发帖数: 17771 | 21 pe3到ce3是ethernet access，pe3到upe是mpls access的h-vpls，在pe3上，需要把对
upe的split-horizon关掉，在upe上就是一个对pe3的software mode eompls。
pe3和upe需要有end to end lsp，所以平时如何setup这个eompls，这里也一样，比如
首先igp converged，然后turn on ldp in the cloud between pe3 and upe，最后就
是一个targed ldp between pe3 and upe for eompls |
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d****i
发帖数: 1038 | 22 在pe3 和ce 之间，
interface Vlan 211
xconnect vfi PE3-VPLS-A
vlan 211 实际和gi6/1是通过trunk port allowed vlan 211 来连接的，
这样，从gi6/1收到的vlan211的packet都会forward给int vlan 211, 然后通过vfi出去。
我的问题是在pe3和upe之间，
interface Vlan 1001
xconnect vfi Internet
这个vlan1001怎么和phisical port连起来？
因为那个physical port还要做pe3 和upe之间的mpls cloud的core facing interface,
必须要配置ip.这样就不能做trunk mode和int vlan连起来了。
你的意思是，在这种情况下，并不需要把svi 和一个physical port 连起来，
只要来自upe的同一个xconnect的packet在pe3的physical port收到后就会forward给vlan 1001，这里svi就相当于在router内部的一个AC? |
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d****i
发帖数: 1038 | 23 Let me use the cisco configuration as an example to elaborate my question:
if I have:
l2 vfi VFI man
vpn id 1111
neighbor 1.1.1.2 pw-class vc4
neighbor 1.1.1.3 pw-class vc5
pseudowire-class vc4
encap mpls
interworking vlan
pseudowire-class vc5
encap mpls
The pw class vc4 will ensure the VC to 1.1.1.2 type 4, while pw class vc5
will generally make VC to 1.1.1.3
type 5. Currently Cisco routers does not support the above configuration
because it does not support
interworking vlan for vpls yet, but ... 阅读全帖 |
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d****i
发帖数: 1038 | 24 Is Junipor solution supporting vc 4 and 5 in the same vpls instance? |
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w*******y
发帖数: 60932 | 25 Dell SB
Sony VPL-BW7 LCD Home Theater Projector
$899.99 - $500 code 8MHZ2TGW8206LC
= $399.99 with free shipping
|
|
z**r
发帖数: 17771 | 26 ☆─────────────────────────────────────☆
zher (民工.暂无) 于 (Wed Mar 29 20:08:21 2006) 提到:
http://www.lightreading.com/document.asp?doc_id=91715&WT.svl=news1_1
不过俺听说的是新的edge router M120，有一些新的密度比较高的ethernet wan card，
主要是做oversubscription的，而且juniper似乎也跟着大家走，推出了ldp based vpls
☆─────────────────────────────────────☆
winterSwan (wake me up inside) 于 (Wed Mar 29 21:13:31 2006) 提到:
你的消息来源是什么?
，
vpls
☆─────────────────────────────────────☆
LieHeart (莱因哈特) 于 (Wed Mar 29 21:46:17 2006) 提到:
Appa |
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d****i
发帖数: 1038 | 27 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 | 28 For more detailed technologies, for example, vpls/vpws, what will be their
roles in the future networks? What specific technical trend will be for vpls
/vpws?
will
virutalization technology, customers' digital properties AND their live data
center are essentially a bunch of files, they can take those files and play
them anywhere else in the cloud, you can have a live data center again in
no time without affecting business continuity. |
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c*****i
发帖数: 631 | 29 IOS XR does support both. 我觉得还是根据客户需求。 |
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z**r
发帖数: 17771 | 30 用bgp的话，如果有route reflector，维护上可能要更方便，更容易scale一些，否则
好像没觉得有什么本质上的优势。 |
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z**r
发帖数: 17771 | 31
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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z**r
发帖数: 17771 | 32 客户为啥要选其中一个呢？ATT IPAG就选择了bgp-pe，最后似乎花落juniper了 |
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d****i
发帖数: 1038 | 33 IOS XR is not IOS. :)
XR does support both, but IOS only support ldp + bgp auto discovery |
|
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c*****i
发帖数: 631 | 35 所以后来xr支持bgp了，为了重新抢market。 |
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z**r
发帖数: 17771 | 36 ATT IPAG是取代现在OPT-E-MAN的下一代att的carrier ethernet network，opt-e-man
上面几万台设备，当然大多数是upe或者managed ce，但是PE也有几百上千，这么多PE
，如果全部用ldp来signal的话，这个full meshed configuration还真不太好维护，有
了RR，的确能简化。 |
|
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c*a
发帖数: 806 | 38 你怎么对这个这么熟?
BGP scaling 还是占优势的。不过很多都是用户adoption决定技术的寿命
like ethernet vs. token ring. 现在很多人还惦念ring topology
man
PE |
|
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t*******r
发帖数: 3271 | 40 Please ask Eric rosen, why virtual router is beat by RFC 2547 back to 10
years ago, control plane signaling aggregation for sure better than
virtualizaing for each customer instance. if multicast bgp can just use PIM
without BGP, can we consider further to remove BGP for unicast as well? i.e
run ospf to cpe, extend ospf to cross the core. |
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s*****g
发帖数: 1055 | 41 Really? hahaha, could you keep it as a secret? |
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w***s
发帖数: 321 | 42 现在用IOS的话，用什么硬件平台？76还是12K？ |
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z**r
发帖数: 17771 | 43 76居多吧，12k上new feature可能都移到xr12k上了 |
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w***s
发帖数: 321 | 44 76不剩几年了，不知道是不是还有人有精力去折腾。 |
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d****i
发帖数: 1038 | 45 what i heard is 7600 still has 10 years of life, and will be replaced by
asr9k.
so it will catch on the features ask9k supports |
|
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z**r
发帖数: 17771 | 47 6500都多少年了，现在马上都要有新的SUP出来了，T级别的 |
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w***s
发帖数: 321 | 48 发挥余热吧，如果15.0没什么新东西，很快就是75那种下场了。 |
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c*****i
发帖数: 631 | 49 不用那么久把，asr9k的feature现在已经逐渐catch up上来了。 |
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t*******r
发帖数: 3271 | 50 SR层面, 应用VPN的话, 主要也就这么几款产品吧, 感觉对流量处理方面, 9K是最差的,
7750是最好的, MX居中. 但做core router, ALU就没戏了, 也从来没有有戏过~
C: 9K
J: MX
ALU: 7750SR
HW不知 |
|
