From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Sun May 11 2008 - 05:53:40 ART
Hi Nitro,
Looks like you are seeing load balancing again across the two links.
Your trace still only shows one hop. The three entries are the first
hops hit by the three packets which were sent by the traceroute, not
three different hops which a single packet has transited.
Paul.
Nitro Drops wrote:
> Hi Joe and All,
>
> Encountered some similar symptons now with OSPF with regards to tracing
>
> R4 S2/1 (155.1.45.4/24) >> Serial >> (155.1.45.5/24)S2/1 R5
> R4 S2/0 (155.1.0.4/24) >> Frame Relay >> (155.1.0.5/24) S2/0 R5
> R4 Loopback 0 - 150.1.4.4
> R5 Loopback 0 - 150.1.5.5
>
> When i did a trace from R4 Loopback 0 to R5 Loopback 0
>
> it shows
>
> 1 155.1.45.5 100 msec
> 155.1.0.5 184 msec
> 155.1.45.5 92 msec
>
> How come the trace is hitting R5 S2/1, to R5 S2/0 and back to R5 S2/1, instead of R5 S2/1 and to R5 Looback?
>
> I encountered the same problem the last time when practising EIGRP, posted the same query, Joe B gave some good advises to disable IP CEF, which i have done on all the serials interfaces, however i am still not seeing a direct
> trace to R5 S2/1 and to R5 Looback.
>
> Thanks for any kind replies.
>
> Cheers
> Nit
>
>
>
>
>
>
> From: nitrodrops@hotmail.com
> To: joe@affirmedsystems.com; ccielab@groupstudy.com
> Subject: RE: EIGRP - Unequal-Cost LoadBalancing
> Date: Tue, 15 Apr 2008 06:31:14 +0800
>
>
>
>
>
>
>
>
> Thanks mate, it works now
>
> it hits the next hop directly. and no more loops.
>
> you are a legend.
>
>
> cheers
> Nit
>
>
>
>> From: joe@affirmedsystems.com
>> To: nitrodrops@hotmail.com; ccielab@groupstudy.com
>> Subject: RE: EIGRP - Unequal-Cost LoadBalancing
>> Date: Fri, 11 Apr 2008 22:18:24 -0400
>>
>> CEF which supersedes the routing table will cause the oldest route to be
>> used.
>>
>> Disable cef
>>
>> No ip cef
>>
>> And then tell us what you found.
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> Nitro Drops
>> Sent: Friday, April 11, 2008 9:53 PM
>> To: ccielab@groupstudy.com
>> Subject: EIGRP - Unequal-Cost LoadBalancing
>>
>> Guys,
>>
>> was practising this scenario.
>>
>> R4 S2/1 (155.1.45.4/24) >> 64K Serial 64K>> (155.1.45.5/24)S2/1 R5
>> R4 S2/0 (155.1.0.4/24) >> 256 K Frame Relay 256K >> (155.1.0.5/24) S2/0 R5
>> R4 Loopback 0 - 150.1.4.4
>> R5 Loopback 0 - 150.1.5.5
>>
>> Variance calculated is 4.
>>
>> R5:
>> router eigrp 100
>> variance 4
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> R5#sh ip eigrp neighbors
>> IP-EIGRP neighbors for process 100
>> H Address Interface Hold Uptime SRTT
>> RTO Q Seq
>> (sec) (ms) Cnt Num
>> 1 155.1.0.4 Se2/0 150 00:42:28 189 1134 0 29
>> 0 155.1.45.4 Se2/1 12 00:44:48 191 2280 0 30
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> R5#sh ip
>> route
>> Gateway of last resort is not set
>> 155.1.0.0/24 is
>> subnetted, 2 subnets
>> C 155.1.0.0 is
>> directly connected, Serial2/0
>> C 155.1.45.0 is
>> directly connected, Serial2/1
>> 150.1.0.0/24 is
>> subnetted, 2 subnets
>> C 150.1.5.0 is
>> directly connected, Loopback0
>> D 150.1.4.0 [90/40640000] via 155.1.45.4,
>> 00:00:46, Serial2/1
>> [90/10639872] via 155.1.0.4,
>> 00:00:46, Serial2/0
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> R5#trace 150.1.4.4
>> Type escape sequence to abort.
>> Tracing the route to 150.1.4.4
>> 1 155.1.45.4 156
>> msec
>> 155.1.0.4 148 msec
>> 155.1.45.4 28 msec
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> R5#trace 150.1.4.4
>> Type escape sequence to abort.
>> Tracing the route to 150.1.4.4
>> 1 155.1.0.4 176 msec
>> 155.1.45.4 128
>> msec
>> 155.1.0.4 152 msec
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> R5#trace 150.1.4.4
>> Type escape sequence to abort.
>> Tracing the route to 150.1.4.4
>> 1 155.1.0.4 168 msec
>> 180 msec *
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> R5#trace 150.1.4.4
>> Type escape sequence to abort.
>> Tracing the route to 150.1.4.4
>> 1 155.1.0.4 152 msec
>> 40 msec *
>>
>>
>> I can see the packets being load-balanced when tracing from R4 to R5's
>> loopback. Did 4 traces continuously and noticed the follows
>>
>> Q1.) For the 1st 2 traces, how come the packets reaches R4's S2/1 interface,
>> it will go to R4's S2/0 interface again before hitting R4's loopback? The
>> same goes for the 2nd trace, it will go to R4's S2/0 interface 1st, followed
>> by R4's S2/1 interface before reaching R4's loopback.
>>
>> Q2) For the 3rd and 4th traces, it hits the R4's loopback0 immediately as
>> next hop, without hitting R4's S2/0 or S2/1.
>>
>>
>> Appreciate any kind advice.
>>
>>
>> Cheers
>> Nit
>>
>>
>>
>>
>>
>>
>>
>>
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