z**r
发帖数: 17771 | 1
waste of time, if he moves the 2 T1's together, the bgp auto load balancing on
the ISP side will take of everything, no use of MLPPP
still waste of time, he has auto load balancing turned on right now, but this
takes care of only the outbound traffic, which is not op's concern |
|
z**r
发帖数: 17771 | 2
waste of time, if he moves the 2 T1's together, the bgp auto load balancing on
the ISP side will take of everything, no use of MLPPP
still waste of time, he has auto load balancing turned on right now, but this
takes care of only the outbound traffic, which is not op's concern |
|
z**r
发帖数: 17771 | 3 first of all, it's nice to see folks to seperate the inbound and the outbound
traffic when considering multihoming.
there are dozens of multihoming scenarios, and your situation fits into the
one as you described exactly. however, there are a couple of things you have
not mentioned yet, are you learning the default routes only? are you learning
a default route from one link and full or partial full bgp routes from another
link? you don't disable any load balancing (which is on by default) manua |
|
z**r
发帖数: 17771 | 4
inbound
I know, the reason I was talking about the whole bgp table was, op mentioned
cisco OER, I think OER is something to deal with outbound traffic, as well as
some limitation of capacity. I have never been saying outbound solution.
care
I considered AS-PATH in the beginning actually, however, I think AS-PATH is
more useful when we have multihome to multiple AS's (multiple ISPs), the best
inbound control in op's situation is still MED I believe. :)
network |
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c*a
发帖数: 806 | 5 OP was asking about inbound traffic, how can whole BGP table help his inbound
traffic?
1> can we prepend AS on the saturated links
2> dynamically change AS using a script based on load of links, but more care
needs to be taken to avoid flip flops, a delay may introduced
3> introduce global load balance via DNS (say set two IP's inside your network
, polling from external, ie, ISP, and dynamically change your IP?)
But if all solutions work around are more expensive than simply upgade the
bandwidt |
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j****r
发帖数: 30 | 6 Thanks for the sample, it doesn't work for us.
The problem is, we only have one /24 network, we cannot advertise two
different networks with different MEDs to the two BGP peers, the ISP
won't take /25.
adjusting |
|
z**r
发帖数: 17771 | 7
what? ft, then it's gonna be a totally different story. I thought you can
advertise multiple routes to your ISP. you sure they won't take /25?
if they won't, then I don't think BGP can solve this issue. let's figure out
other ways. let's dig into cisco OER again then, hehe |
|
z**r
发帖数: 17771 | 8
waste of time, if he moves the 2 T1's together, the bgp auto load balancing on
the ISP side will take of everything, no use of MLPPP
still waste of time, he has auto load balancing turned on right now, but this
takes care of only the outbound traffic, which is not op's concern |
|
z**r
发帖数: 17771 | 9 first of all, it's nice to see folks to seperate the inbound and the outbound
traffic when considering multihoming.
there are dozens of multihoming scenarios, and your situation fits into the
one as you described exactly. however, there are a couple of things you have
not mentioned yet, are you learning the default routes only? are you learning
a default route from one link and full or partial full bgp routes from another
link? you don't disable any load balancing (which is on by default) manua |
|
c*a
发帖数: 806 | 10 OP was asking about inbound traffic, how can whole BGP table help his inbound
traffic?
1> can we prepend AS on the saturated links
2> dynamically change AS using a script based on load of links, but more care
needs to be taken to avoid flip flops, a delay may introduced
3> introduce global load balance via DNS (say set two IP's inside your network
, polling from external, ie, ISP, and dynamically change your IP?)
But if all solutions work around are more expensive than simply upgade the
bandwidt |
|
z**r
发帖数: 17771 | 11 I think NAT is not a choice for him, since he even has the whole BGP routes (
not only 2 defaut routes)
and |
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j****r
发帖数: 30 | 12
depends
originate
We knew ISP could set local-pref based on source IPs or ASes. The problem
is, ISP might do things once, but won't do adjustment for us daily. BGP
adjustment is a long term daily work.
I am still thinking about this. The ISP is not taking anything longer than
/24, I am not sure if we can do it based on source IPs or ASes.
to
The ISP is not taking anything longer than /24.
滑阴道减少不适感，但在阴茎头部不要涂得太多，否则容易使避孕套脱落。
(4)射精后不要将阴茎长时间留在阴道内，应在阴茎未软缩之前，用手按住套
口使阴茎连同避孕套一起从阴道内抽出，以防阴茎软缩后避孕套脱落在阴道内
或精 |
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c*a
发帖数: 806 | 13 One req from OP (dynamically L/B) is almost impossible with BGP without doing
more intelligent monitoring/dynamic configuration
reading some white paper now about L/B, quite complicated, and this is even
only with static (predefined algorithm) L/B |
|
z**r
发帖数: 17771 | 14 ☆─────────────────────────────────────☆
jaguar (haha) 于 (Thu Mar 9 09:28:52 2006) 提到:
All Cisco experts,
We are running bgp on many routers for Internet load balance. We have two T1
circuits from one ISP, let's focus on these two T1 circuits.
On our side, the two Ts terminate on the same router, on ISP side, they
terminate on different routers. Most of time, one circuit got 100% saturated,
the other one has only 20% usage.
Is there any way easy to adjust the load between the circuits? we o |
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z**r
发帖数: 17771 | 15 俺最需要的就是比如能从"show ip bgp ..."的output提取足够信息然后直接playback |
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z**r
发帖数: 17771 | 16 恩，这个就是俺需要的。你问问他需要什么版本的ixia软件，另外具体哪个命令的结果
存成csv file，就是show ip bgp？多谢 |
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d****i
发帖数: 1038 | 17 spirent testcenter 2.2 也可以。 好像直接从cisco router里
dump 出来bgp routes, 然后就可以import到STC里了。
不过在stc的gui里这些imported route不能编辑。 STC 兼容最好的
就是cisco乐。 赫赫 |
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z**r
发帖数: 17771 | 18 chongqi说ixia下个版本有这个功能，就是把show ip bgp的output import 到
ixianetwork软件里，就可以 |
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d****i
发帖数: 1038 | 19 那这个stc2.2可以做，当初这个功能就是cisco要求的，所以当初只支持
cisco的show output。 呵呵。
import进去之后还可以由stc的bgp router再发出来。 |
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z**r
发帖数: 17771 | 20 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 | 21
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 | 22 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 | 23 IOS XR is not IOS. :)
XR does support both, but IOS only support ldp + bgp auto discovery |
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d****i
发帖数: 1038 | 24 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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c*****i
发帖数: 631 | 25 所以后来xr支持bgp了，为了重新抢market。 |
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d****i
发帖数: 1038 | 26 这些都是XR的平台。
IOS 加bgp vpls还没影儿呢。 |
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c*a
发帖数: 806 | 27 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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d****i
发帖数: 1038 | 28 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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s*******8
发帖数: 12734 | 29 屏幕不断地出现这个，
是说不支持ipv6的意思么？
PE-host那边是ipv6，PE-PE是ipv4，PE上面还有RIPv2，mpls，和BGP，我胡乱配了一下
，2个PE就出现了这个警报了。
Any suggestion？ |
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s*******8
发帖数: 12734 | 30 router bgp 1
neighbor 10.2.1.3 remote-as 1
neighbor 10.2.1.3 update-source loopback0
no auto
address-family ipv6
neighbor 10.2.1.3 activate
neighbor 10.2.1.3 send-community both
neighbor 10.2.1.3 send-label
redistribute connected
redistribute rip-------这个是我新加的，还没试。
exit-address-family
谢谢saiwong |
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m********d
发帖数: 188 | 31
address-family ipv6
neighbor activate
和
address-family ipv6
neighbor activate
是不同的配置ipv6 bgp的方法。 |
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s*******8
发帖数: 12734 | 32 我当然知道了，title就是6PE啊。刚刚瞎搞出来了。抄树上的。还不太明白，我加了个
这个，问题解决。给你1个包子，回头好好思考一下你说的那个neighbor
ipv6 router rip custone
redistribute bgp 1 |
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s*******8
发帖数: 12734 | 33 "I don't see IPv6 BGP neighbor under ipv6 unicast address family. "
为什么neighbor要放在address family下面啊？ |
|
z**r
发帖数: 17771 | 34 对了，正好有个问题请教，如果一个router已经对OSPF不堪重负了，换成BGP能对CPU
usage有多大提高？有没有这样的比较？ |
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c*****i
发帖数: 631 | 35 ospf的scale太大？你的客户不是有测bgp 3107吗？问问他们或者BU有没有这方面的
data。 |
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z**r
发帖数: 17771 | 36 scale参见上贴。光侧3107没用啊，只能给出BGP的scalability，现在要的是
difference，实在没办法只好自己动手测试了 |
|
p**x
发帖数: 123 | 37 bgp requires direct tcp connection in order to form peering, otherwise
multihop is required. in your case, 172.16.20.1 should be a remote loopback
address or a indirect physical address. |
|
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L******t
发帖数: 1985 | 39 BGP by Iljitsch van Beijnum
//disclaimer: didn't read the book myself. |
|
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s******v
发帖数: 4495 | 41 就是因为这个，
neighbor x.x.x.x remote-as 1
neighbor x.x.x.x upd loopback0 (if y.y.y.y)
R1 bgp 第一步建立tcp，src = y.y.y.y, dest = x.x.x.x，到了R2，无法建立tcp，因
为没有route回到y.y.y.y。
ebgp-mhop是另外一个因素。 |
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x*********n
发帖数: 28013 | 42 BGP是不能孤立存在的，底层肯定要有东西的，一般isp都是走static route，我买的
lab刚好用的是eigrp，所以才能ping的通啊。 |
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t*******r
发帖数: 3271 | 43 LZ应该把BGP table全导到IGP里看看结果.... |
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c*****i
发帖数: 631 | 44 NSR在RP Failover以后不需要reestablish bgp session。对large scale router来说
impact要小。另外一个是对large scale router，调nsf的hold time也是个需要试的东
西。 |
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l***y
发帖数: 791 | 45 Restarting peer will only send session reset for BGP ONLY when RP switchover
is by command; if active RP goes dead, no packet will be transmitted from
the restarting peer, not even tcp keepalives; the standby RP takes over and
initiates a new session with each peer. In this case the receiving peers
ideally have gone into HA helper mode will not flush the pfx right then but
completes the HA process with the restarting peer.
Depending on how soon the standby RP takes over and initiates the new
ses... 阅读全帖 |
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s******v
发帖数: 4495 | 46 用eibgp mpath, 在locprf, aspath等等atributes相同的情况下, rib可以install up
to 6 bgp routes to same destination. |
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n**********l
发帖数: 271 | 47 But BGP only advertise the best path to peers?
up |
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