The MPLS-OPS Archive

[CEW CEW <cewsg@yahoo.com>]

Hi...

Has anyone ever encounter problem with tag-switching
over frame relay using 12.1.5T12 and 12.1.5T10 with
3600 and 7200 platform ?

Below is my problem

[r1]----FR-----[r2]-----[r5]

r1 trying to reach r5 (5.5.5.5) loopback

THe control plane and forwarding plane looks OK, but
the ping just couldn't get through. Removing tag
switching at r1, ping is OK.

Below some show output. Pls see comments in ######

Thanks in advance.

THanks
Eng Wee



r1-3640#i
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
       i - IS-IS, 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
C       1.1.1.1 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
i L2    2.2.2.2 [115/20] via 10.10.123.2, Serial2/0
     4.0.0.0/32 is subnetted, 1 subnets
i L2    4.4.4.4 [115/20] via 10.10.14.4, Serial2/2
     5.0.0.0/32 is subnetted, 1 subnets
i L2    5.5.5.5 [115/30] via 10.10.123.2, Serial2/0
     10.0.0.0/24 is subnetted, 3 subnets
C       10.10.14.0 is directly connected, Serial2/2
i L2    10.10.25.0 [115/20] via 10.10.123.2, Serial2/0
C       10.10.123.0 is directly connected, Serial2/0

##### r1 is able to reach 5.5.5.5 via s2/0



r1-3640#sh tag-switching tdp dis
Local TDP Identifier:
    1.1.1.1:0
TDP Discovery Sources:
    Interfaces:
        Serial2/0: xmit/recv
            TDP Id: 2.2.2.2:0
        Serial2/2: xmit/recv
            TDP Id: 4.4.4.4:0
##### tag-switching neighbor is OK


r1-3640#sh tag-switching forwarding-table 
Local  Outgoing    Prefix            Bytes tag 
Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched  
interface              
16     Pop tag     2.2.2.2/32        0          Se2/0 
    10.10.123.2  
18     18          5.5.5.5/32        0          Se2/0 
    10.10.123.2  
19     Pop tag     10.10.25.0/24     0          Se2/0 
    10.10.123.2  
20     Pop tag     4.4.4.4/32        0          Se2/2 
    point2point  
r1-3640#

#### tag-switching forwarding table for 5.5.5.5
is ok, with local label 18, outgoing label 18



r1-3640#sh tag tdp bin 5.5.5.5 32
  tib entry: 5.5.5.5/32, rev 45
        local binding:  tag: 18
        remote binding: tsr: 2.2.2.2:0, tag: 18
        remote binding: tsr: 4.4.4.4:0, tag: 31
##### LIB looks good as well, r1 uses the
label distributed from r2(2.2.2.2)=18



r2-7206#i  
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
       i - IS-IS, 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
i L2    1.1.1.1 [115/20] via 10.10.123.1, Serial3/0.1
     2.0.0.0/32 is subnetted, 1 subnets
C       2.2.2.2 is directly connected, Loopback0
     4.0.0.0/32 is subnetted, 1 subnets
i L2    4.4.4.4 [115/30] via 10.10.123.1, Serial3/0.1
     5.0.0.0/32 is subnetted, 1 subnets
i L2    5.5.5.5 [115/20] via 10.10.25.5, Serial3/1
     10.0.0.0/24 is subnetted, 3 subnets
i L2    10.10.14.0 [115/20] via 10.10.123.1,
Serial3/0.1
C       10.10.25.0 is directly connected, Serial3/1
C       10.10.123.0 is directly connected, Serial3/0.1

###### r2 can reach 5.5.5.5 via s3/1


r2-7206#sh tag-switching forwarding-table 
Local  Outgoing    Prefix            Bytes tag 
Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched  
interface              
16     Pop tag     1.1.1.1/32        2726      
Se3/0.1    10.10.123.1  
18     Pop tag     5.5.5.5/32        0          Se3/1 
    point2point  
19     Pop tag     10.10.14.0/24     0         
Se3/0.1    10.10.123.1  
20     20          4.4.4.4/32        0         
Se3/0.1    10.10.123.1  

##### LFIB  at r2 looks OK, 5.5.5.5 has an incoming
label of 18 and outgoing label of POP.


r2-7206#sh tag-switching tdp bindings 5.5.5.5 32
  tib entry: 5.5.5.5/32, rev 8
        local binding:  tag: 18
        remote binding: tsr: 5.5.5.5:0, tag: imp-null
        remote binding: tsr: 1.1.1.1:0, tag: 18
###### LIB of r2 looks OK, r2 receive imp-null
from r5 (5.5.5.5) to  POP the tag. PEN-HOP popping.


r1-3640#ping 5.5.5.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is
2 seconds:
.....
Success rate is 0 percent (0/5)
#### r1 just can't ping 5.5.5.5


r1-3640#conf t
r1-3640(config)#int s2/0
r1-3640(config-if)#no tag ip
r1-3640#
r1-3640#ping 
02:32:48: %SYS-5-CONFIG_I: Configured from console by
console5.5.5.5

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is
2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip
min/avg/max = 4/5/8 ms

###### remove tag-switching i at r1 FR interface, ping
is OK.


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