Well.....
The DSG elaborates on what is actually being taught in the exercise but my
question is kind of why is it not working anyway. If I look at the DSG though
it shows no label in and out when you do a show ip bgp labels
But on my routers I do have labels:
R2#sh ip bgp labels
Network Next Hop In label/Out label
1.1.1.1/32 78.78.78.8 nolabel/nolabel
24.1.1.1 nolabel/exp-null
24.24.24.2/32 0.0.0.0 imp-null(from LDP)/nolabel
24.24.24.4/32 24.24.24.4 18(from LDP)/nolabel
56.56.56.5/32 24.24.24.4 16(from LDP)/nolabel
56.56.56.6/32 24.24.24.4 20/nolabel
78.78.78.7/32 78.78.78.8 21/nolabel
78.78.78.8/32 24.1.1.1 nolabel/275228
I will admit that MPLS is probably my weakest area. Should I not have any
labels like the DSG shows? What would cause me to have labels? Is this why
the ping is not working? Why would it not generate any output when I am
debugging ip packet and mpls packet. When I disable CEF I still have labels
but the pings work. ???? Thanks for your response.
Patrick A Baldwin
________________________________________
From: Marko Milivojevic [[email protected]]
Sent: Friday, June 29, 2012 6:17 PM
To: Baldwin, Patrick A. (MSFC-EO60)[HOSC SERVICES CONTRACT]
Cc: [email protected]
Subject: Re: [OSL | CCIE_RS] Volume 3 LAB 7T Weird Problem
Isn't it elaborated in the DSG and the solution videos?
--
Marko Milivojevic - CCIE #18427
:: This message was sent from a mobile device. I apologize for errors and
brevity. ::
On Jun 29, 2012, at 8:55, "Baldwin, Patrick A. (MSFC-EO60)[HOSC SERVICES
CONTRACT]"<[email protected]> wrote:
> Yes it is marko. I have send-label on my neighbor statement. Can you
> elaborate? I might be about to learn something here.
>
> Patrick A Baldwin
>
> On Jun 29, 2012, at 7:51 AM, "Marko Milivojevic" <[email protected]> wrote:
>
>> Is this the one where BB sits between peers? Could you perhaps send BB some
>> labels to make this work? :-)
>>
>> --
>> Marko Milivojevic - CCIE #18427
>>
>> :: This message was sent from a mobile device. I apologize for errors and
>> brevity. ::
>>
>> On Jun 29, 2012, at 1:01, "Baldwin, Patrick A. (MSFC-EO60)[HOSC SERVICES
>> CONTRACT]"<[email protected]> wrote:
>>
>>> Hi Experts,
>>>
>>> Lets see if anyone can help me shed some light on this weird issue in Vol 3
>>> Lab 7T ticket two. The solution is to setup a EBGP multi hop neighbor
>>> relationship between R8 and R2 and I understand all of that. The problem
>>> is what my routers are doing and it is driving me nuts.
>>>
>>> R2 will not form a BGP neighbor relationship with R8 in fact it cannot ping
>>> R8 via the BGP route. If I replace the BGP route with a temporary static
>>> route or disable CEF then everything works as expected.
>>>
>>> I notice that the BGP route contains a label while the static route does
>>> not, I also understand that MPLS requires CEF so by disabling CEF I am
>>> probably bypassing MPLS. Therefore I think the weirdness relates to MPLS
>>> but I cannot for the life of me figure it out. Lots and lots of show
>>> commands below..... Any ideas what Im doing wrong?
>>>
>>> Thanks
>>>
>>> Patrick A Baldwin
>>>
>>> R2#sh ip cef
>>> %IPv4 CEF not running
>>> R2#sh ip ro
>>> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
>>> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
>>> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
>>> E1 - OSPF external type 1, E2 - OSPF external type 2
>>> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
>>> ia - IS-IS inter area, * - candidate default, U - per-user static route
>>> o - ODR, P - periodic downloaded static route
>>>
>>> Gateway of last resort is not set
>>>
>>> 1.0.0.0/32 is subnetted, 1 subnets
>>> B 1.1.1.1 [20/0] via 24.1.1.1, 05:07:56
>>> 24.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
>>> C 24.24.1.0/24 is directly connected, GigabitEthernet0/1.24
>>> C 24.24.2.0/24 is directly connected, Serial1/1
>>> O IA 24.56.45.0/24 [110/49] via 24.24.1.4, 05:08:26,
>>> GigabitEthernet0/1.24
>>> C 24.1.1.0/24 is directly connected, GigabitEthernet0/1.201
>>> C 24.1.1.1/32 is directly connected, GigabitEthernet0/1.201
>>> C 24.24.24.2/32 is directly connected, Loopback0
>>> O 24.24.24.4/32 [110/2] via 24.24.1.4, 05:08:27, GigabitEthernet0/1.24
>>> 78.0.0.0/32 is subnetted, 2 subnets
>>> B 78.78.78.8 [20/0] via 24.1.1.1, 05:07:57
>>> B 78.78.78.7 [20/0] via 78.78.78.8, 04:26:23
>>> 56.0.0.0/32 is subnetted, 2 subnets
>>> O E2 56.56.56.5 [110/20] via 24.24.1.4, 05:08:29, GigabitEthernet0/1.24
>>> B 56.56.56.6 [200/0] via 24.24.24.4, 05:07:59
>>>
>>> R2#sh ip ro 78.78.78.8
>>> Routing entry for 78.78.78.8/32
>>> Known via "bgp 24", distance 20, metric 0
>>> Tag 1, type external
>>> Last update from 24.1.1.1 05:08:41 ago
>>> Routing Descriptor Blocks:
>>> * 24.1.1.1, from 24.1.1.1, 05:08:41 ago
>>> Route metric is 0, traffic share count is 1
>>> AS Hops 2
>>> Route tag 1
>>>
>>> R2#sh ip ro 24.1.1.1
>>> Routing entry for 24.1.1.1/32
>>> Known via "connected", distance 0, metric 0 (connected, via interface)
>>> Redistributing via bgp 24
>>> Routing Descriptor Blocks:
>>> * directly connected, via GigabitEthernet0/1.201
>>> Route metric is 0, traffic share count is 1
>>>
>>>
>>> R2#sh arp
>>> Protocol Address Age (min) Hardware Addr Type Interface
>>> Internet 24.1.1.1 71 000c.8532.8500 ARPA
>>> GigabitEthernet0/1.201
>>> Internet 24.1.1.2 - 0012.d9dd.671b ARPA
>>> GigabitEthernet0/1.201
>>> Internet 24.24.1.2 - 0012.d9dd.671b ARPA
>>> GigabitEthernet0/1.24
>>> Internet 24.24.1.4 72 001b.54fb.a5c9 ARPA
>>> GigabitEthernet0/1.24
>>>
>>> R2#conf t
>>> Enter configuration commands, one per line. End with CNTL/Z.
>>> R2(config)#ip cef
>>> R2(config)#exit
>>> R2#
>>> R2#sh ip cef adj g0/1.201 24.1.1.1
>>> 24.1.1.1/32
>>> attached to GigabitEthernet0/1.201
>>> R2#sh arp
>>> Protocol Address Age (min) Hardware Addr Type Interface
>>> Internet 24.1.1.1 72 000c.8532.8500 ARPA
>>> GigabitEthernet0/1.201
>>> Internet 24.1.1.2 - 0012.d9dd.671b ARPA
>>> GigabitEthernet0/1.201
>>> Internet 24.24.1.2 - 0012.d9dd.671b ARPA
>>> GigabitEthernet0/1.24
>>> Internet 24.24.1.4 72 001b.54fb.a5c9 ARPA
>>> GigabitEthernet0/1.24
>>>
>>> R2#sh ip ro 24.1.1.1
>>> Routing entry for 24.1.1.1/32
>>> Known via "connected", distance 0, metric 0 (connected, via interface)
>>> Redistributing via bgp 24
>>> Routing Descriptor Blocks:
>>> * directly connected, via GigabitEthernet0/1.201
>>> Route metric is 0, traffic share count is 1
>>>
>>> R2#sh ip ro 78.78.78.8
>>> Routing entry for 78.78.78.8/32
>>> Known via "bgp 24", distance 20, metric 0
>>> Tag 1, type external
>>> Last update from 24.1.1.1 05:10:59 ago
>>> Routing Descriptor Blocks:
>>> * 24.1.1.1, from 24.1.1.1, 05:10:59 ago
>>> Route metric is 0, traffic share count is 1
>>> AS Hops 2
>>> Route tag 1
>>>
>>> R2#sh bgp sum
>>> BGP router identifier 24.24.24.2, local AS number 24
>>> BGP table version is 10, main routing table version 10
>>> 7 network entries using 924 bytes of memory
>>> 8 path entries using 416 bytes of memory
>>> 11/6 BGP path/bestpath attribute entries using 1848 bytes of memory
>>> 5 BGP AS-PATH entries using 120 bytes of memory
>>> 0 BGP route-map cache entries using 0 bytes of memory
>>> 0 BGP filter-list cache entries using 0 bytes of memory
>>> Bitfield cache entries: current 6 (at peak 6) using 192 bytes of memory
>>> BGP using 3500 total bytes of memory
>>> BGP activity 14/0 prefixes, 15/0 paths, scan interval 60 secs
>>>
>>> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
>>> State/PfxRcd
>>> 24.1.1.1 4 1 321 318 10 0 0 05:12:21
>>> 2
>>> 24.24.24.4 4 24 318 318 10 0 0 05:11:34
>>> 3
>>> 78.78.78.8 4 78 274 275 10 0 0 04:29:37
>>> 2
>>>
>>> R2#ping 24.1.1.1 so 24.24.24.2
>>>
>>> Type escape sequence to abort.
>>> Sending 5, 100-byte ICMP Echos to 24.1.1.1, timeout is 2 seconds:
>>> Packet sent with a source address of 24.24.24.2
>>> !!!!!
>>> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
>>>
>>> R2#ping 78.78.78.8 so 24.24.24.2
>>>
>>> Type escape sequence to abort.
>>> Sending 5, 100-byte ICMP Echos to 78.78.78.8, timeout is 2 seconds:
>>> Packet sent with a source address of 24.24.24.2
>>> .....
>>> Success rate is 0 percent (0/5)
>>> R2#
>>> *Jun 28 18:05:43.522: %BGP-3-NOTIFICATION: received from neighbor
>>> 78.78.78.8 4/0 (hold time expired) 0 bytes
>>> R2#
>>> *Jun 28 18:05:43.522: %BGP-5-ADJCHANGE: neighbor 78.78.78.8 Down BGP
>>> Notification received
>>>
>>> R2#ping 24.1.1.1 so 24.24.24.2
>>>
>>> Type escape sequence to abort.
>>> Sending 5, 100-byte ICMP Echos to 24.1.1.1, timeout is 2 seconds:
>>> Packet sent with a source address of 24.24.24.2
>>> !!!!!
>>> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
>>> R2#sh ip cef
>>> Prefix Next Hop Interface
>>> 0.0.0.0/0 no route
>>> 0.0.0.0/8 drop
>>> 0.0.0.0/32 receive
>>> 1.1.1.1/32 24.1.1.1 GigabitEthernet0/1.201
>>> 24.1.1.0/24 attached GigabitEthernet0/1.201
>>> 24.1.1.0/32 receive GigabitEthernet0/1.201
>>> 24.1.1.1/32 attached GigabitEthernet0/1.201
>>> 24.1.1.2/32 receive GigabitEthernet0/1.201
>>> 24.1.1.255/32 receive GigabitEthernet0/1.201
>>> 24.24.1.0/24 attached GigabitEthernet0/1.24
>>> 24.24.1.0/32 receive GigabitEthernet0/1.24
>>> 24.24.1.2/32 receive GigabitEthernet0/1.24
>>> 24.24.1.4/32 attached GigabitEthernet0/1.24
>>> 24.24.1.255/32 receive GigabitEthernet0/1.24
>>> 24.24.2.0/24 attached Serial1/1
>>> 24.24.2.0/32 receive Serial1/1
>>> 24.24.2.2/32 receive Serial1/1
>>> 24.24.2.4/32 attached Serial1/1
>>> 24.24.2.255/32 receive Serial1/1
>>> 24.24.24.2/32 receive Loopback0
>>> 24.24.24.4/32 24.24.1.4 GigabitEthernet0/1.24
>>> 24.56.45.0/24 24.24.1.4 GigabitEthernet0/1.24
>>> Prefix Next Hop Interface
>>> 56.56.56.5/32 24.24.1.4 GigabitEthernet0/1.24
>>> 56.56.56.6/32 24.24.1.4 GigabitEthernet0/1.24
>>> 78.78.78.8/32 24.1.1.1 GigabitEthernet0/1.201
>>> 127.0.0.0/8 drop
>>> 224.0.0.0/4 multicast
>>> 224.0.0.0/24 receive
>>> 240.0.0.0/4 drop
>>> 255.255.255.255/32 receive
>>> R2#sh arp
>>> Protocol Address Age (min) Hardware Addr Type Interface
>>> Internet 24.1.1.1 74 000c.8532.8500 ARPA
>>> GigabitEthernet0/1.201
>>> Internet 24.1.1.2 - 0012.d9dd.671b ARPA
>>> GigabitEthernet0/1.201
>>> Internet 24.24.1.2 - 0012.d9dd.671b ARPA
>>> GigabitEthernet0/1.24
>>> Internet 24.24.1.4 75 001b.54fb.a5c9 ARPA
>>> GigabitEthernet0/1.24
>>>
>>>
>>> R2#sh mpls forwarding-table 78.78.78.8 det
>>> Local Outgoing Prefix Bytes Label Outgoing Next Hop
>>> Label Label or VC or Tunnel Id Switched interface
>>> None 275228 78.78.78.8/32 0 drop
>>> MAC/Encaps=0/4, MRU=0, Label Stack{275228}
>>> 4331C000
>>> No output feature configured
>>>
>>> R2#debug cef all
>>> All CEF debugging is on
>>> *Jun 28 18:11:20.542: FIBif: Processing queued interface events
>>> *Jun 28 18:11:20.542: FIBif: [sw:<unknown>(11) 67D2F71C] Coming up
>>> *Jun 28 18:11:20.542: FIBif: [sw:<unknown>(11) 67D2F71C] Failed: Interface
>>> not really up
>>> *Jun 28 18:11:20.542: FIBif: Restarting queued interface events
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path
>>> list
>>> *Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking
>>> path list
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path
>>> list
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking
>>> path list
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Locked path
>>> list
>>> *Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:2
>>> R2#ping 78.1.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Unlocking path
>>> list
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Locked path
>>> list
>>> *Jun 28 18:11:21.330: HW-API: Counter poll: Label[connid=1048577]
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Unlocking
>>> path list
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
>>> 683F41F4(3)] Locked path list
>>> *Jun 28 18:11:21.330: HW-API: Counter poll: Label[label=none]
>>> *Jun 28 18:11:21.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
>>> 683F41F4(3)] Unlocking path list
>>> R2#ping 78.78.78.8 so 24.24.
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path
>>> list
>>> *Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking
>>> path list
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path
>>> list
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking
>>> path list
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Locked path
>>> list
>>> *Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
>>> R2#ping 78.78.78.8 so 24.24.24.
>>> *Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Unlocking
>>> path list
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Locked path
>>> list
>>> *Jun 28 18:11:31.330: HW-API: Counter poll: Label[connid=1048577]
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Unlocking
>>> path list
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
>>> 683F41F4(3)] Locked path list
>>> *Jun 28 18:11:31.330: HW-API: Counter poll: Label[label=none]
>>> *Jun 28 18:11:31.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
>>> 683F41F4(3)] Unlocking path list
>>> R2#ping 78.78.78.8 so 24.24.24.2
>>>
>>> Type escape sequence to abort.
>>> Sending 5, 100-byte ICMP Echos to 78.78.78.8, timeout is 2 seconds:
>>> Packet sent with a source address of 24.24.24.2
>>>
>>> *Jun 28 18:11:35.542: FIBif: Processing queued interface events
>>> *Jun 28 18:11:35.542: FIBif: [sw:<unknown>(11) 67D2F71C] Coming up
>>> *Jun 28 18:11:35.542: FIBif: [sw:<unknown>(11) 67D2F71C] Failed: Interface
>>> not really up
>>> *Jun 28 18:11:35.542: FIBif: Restarting queued interface events...
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path
>>> list
>>> *Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking
>>> path list
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Locked path
>>> list
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-r 677B2B1C(6)] Unlocking
>>> path list
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Locked path
>>> list
>>> *Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=implicit-null]
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-r 66C16C10(2)] Unlocking
>>> path list
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Locked path
>>> list
>>> *Jun 28 18:11:41.330: HW-API: Counter poll: Label[connid=1048577]
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v6-sp 66C16B78(2)] Unlocking
>>> path list
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
>>> 683F41F4(3)] Locked path list
>>> *Jun 28 18:11:41.330: HW-API: Counter poll: Label[label=none]
>>> *Jun 28 18:11:41.330: FIBpathlist: {l-u} [1:v4-rnh-24.24.24.4[v4:Default]
>>> 683F41F4(3)] Unlocking path list..
>>> Success rate is 0 percent (0/5)
>>> R2#
>>> R2#u all
>>> All possible debugging has been turned off
>>>
>>> R2#sh mpls forwarding-table
>>> Local Outgoing Prefix Bytes Label Outgoing Next Hop
>>> Label Label or VC or Tunnel Id Switched interface
>>> 20 No Label 56.56.56.6/32 0 Gi0/1.24 24.24.1.4
>>>
>>> R2#sh cef fib
>>> 30 allocated IPv4 entries, 0 failed allocations
>>> 11 allocated IPv6 entries, 0 failed allocations
>>>
>>> R2#sh cef int
>>> GigabitEthernet0/1 is up (if_number 2)
>>> Corresponding hwidb fast_if_number 13
>>> Corresponding hwidb firstsw->if_number 2
>>> Internet Protocol processing disabled
>>> Hardware idb is GigabitEthernet0/1
>>> Fast switching type 1, interface type 27
>>> IP CEF switching enabled
>>> IP CEF switching turbo vector
>>> IP CEF turbo switching turbo vector
>>> IP prefix lookup IPv4 mtrie 8-8-8-8 optimized
>>> Input fast flags 0x0, Output fast flags 0x0
>>> ifindex 7(7)
>>> Slot Slot unit 1 VC -1
>>> Transm
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