RSVP Hello for Fast Reroute
Hi,
i am trying to set up TE tunnels with Fast Reroute protection. As i am using FastEthernet and GigabitEthernet links i need to use RSVP Hello for link or node failure detection.
I have a little problem understanding and properly configuring the rsvp hello feature. The topology looks as follows:
PE1 - P1 - PE2
| |
P3 ----------- P4
I am trying to set up fast reroute to protect the connection PE1-P1-PE2 with backup path PE1-P3-P4-PE2. Both primary and backup tunnels are set up and working. I configure RSVP Hello on the link between PE1 and P1 with following commands on PE1 and P1:
PE1#configure terminal
PE1(config)#interface Fastethernet 0/0
PE1(config-if)ip rsvp signalling hello
PE1(config-if)ip rsvp signalling hello refresh interval 50
P1#configure terminal
P1(config)#interface Fastethernet 0/0
P1(config-if)ip rsvp signalling hello
P1(config-if)ip rsvp signalling hello refresh interval 50
After issuing the sh ip rsvp hello instance detail command on PE1 i can see that the RSVP hello session is active:
Neighbor 195.10.3.1 (router ID: 3.3.3.3) Source 195.10.3.254
Type: Active (sending requests)
I/F: FastEthernet0/0
State: Up (Since: 2012 January Thursday 12 00:14:22 )
Clients: Fast Reroute
LSPs protecting: 1
Missed acks: 4, IP DSCP: 0x30
Refresh Interval (msec)
Configured: 50
However on the P1 router the output shows different values:
Neighbor 195.10.3.254 (router ID: 33.33.33.33) Source 195.10.3.1
Type: Active (sending requests)
I/F: FastEthernet0/0
State: Up (Since: 2012 January Wednesday 11 23:43:18 )
Clients: ReRoute
LSPs protecting: 3
Missed acks: 4, IP DSCP: 0x30
Refresh Interval (msec)
Configured: 2000
The configuration guide for IOS 12.2SR refers to active instances:
If a neighbor is unreachable when an LSP is ready to be fast rerouted, an active Hello instance is needed. Create an active Hello instance for each neighbor with at least one LSP in this state.
and to passive instances:
Passive Hello instances respond to Hello Request messages (sending Ack messages), but do not initiate Hello Request messages and do not cause LSPs to be fast rerouted.
At this point i am not sure if i configured the RSVP Hello properly. After shuting the interface FastEthernet 0/0 on P1 down i do get the backup tunnel active and rerouted, but the convergence time is too slow. I would expect the convergence time to be 4xRSVP Hello interval which is 4x50=200ms. However, the testing revealed the convergence time to be round 2,5 seconds. My goal is to get the convergence time under 300ms.
The question is, what is the actual difference between active and passive rsvp hello session? What does the Clients statement in the sh ip rsvp hello instance detail command mean and shoud i see the same interval on both ends of the link?
If you need any other specification, i will provide any other show command outputs necessary.
Thank you for any help or clarifiation.
Adrian
Adrian,
Would it be possible to post the relevant tunnel configurations from your PE routers? From what you described, I am not sure if you want to achieve an MPLS path protection, MPLS link protection (NHOP) or MPLS node protection (NNHOP) here.
Best regards,
Peter
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Hi Experts,
I'm just getting started with MPLS TE and wondering on how fast the "fast reroute" feature can be.
I'm planning to create two tunnels for a specific traffic of my network, and looks like MPLS TE with FRR is the most reliable option if we are talking about a really 0% packet loss network.
I saw on some documentations that with MPLS TE is possible to reroute the traffic with 50 ms of RTT and no packet loss at all, considering that the backup tunnel is so reliable as the primary is.
Is this true? I'm new on this subject so I would like to know more about what I could achieve in terms of high availability.
Regards
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Yes MPLS-TE with FRR gives faster convergence in range of 50ms (usually 50ms is standard convergence time for SDH/Sonet network). But there are some pre-requisities for MPLS-TE FRR to provide that faster convergence.
Tunnel Headend -- Router 1 --- Router 2 ---- Router 3--- Tunnel Tailend
-- Router 4 ---- Router 5----
MPLS-TE FRR protects a particular link or a particular node.
For link protection, the concept is to have a primary tunnel protected by a backup tunnel. The backup tunnel path should be on completely different and fault tolerant physical path when the primary tunnel path fails i.e. both the tunnels should not be in same SRLG links. In the above case if link between Router1-Router2-Router3 fails the tunnel should fallback over Router 4 and Router 5.
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MPLS-TE FRR wokrs by pre-signalling LSP over both primary and secondary paths even before the failure occurs. In normal conditions (with multiple path-option), only when primary LSP on primary path goes down, LSP gets signalled over secondary path option.
HTH
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Routers are on a ring : br01(ge3/2)--(ge3/1)br03--br02--br04(ge3/2)--(ge3/1)br01
tunnel50 is the straight route and tunnel 51 is the low route
*Here the output from br04
br04-7600-mtp02#show mpls traffic-eng tunnels brief
Signalling Summary:
LSP Tunnels Process: running
Passive LSP Listener: running
RSVP Process: running
Forwarding: enabled
Periodic reoptimization: every 3600 seconds, next in 2803 seconds
Periodic FRR Promotion: Not Running
Periodic auto-bw collection: every 300 seconds, next in 103 seconds
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TUNNEL NAME DESTINATION UP IF DOWN IF STATE/PROT
br04-7600-mtp02_t50 94.103.128.56 - Gi3/2 up/up
br04-7600-mtp02_t51 94.103.128.56 - Gi3/1 up/up
br01-7600-par01_t50 94.103.128.59 Gi3/2 - up/up
br01-7600-par01_t51 94.103.128.59 Gi3/1 - up/up
Displayed 2 (of 2) heads, 0 (of 0) midpoints, 2 (of 2) tails
P2MP TUNNELS:
Displayed 0 (of 0) P2MP heads
P2MP SUB-LSPS:
Displayed 0 P2MP sub-LSPs:
0 (of 0) heads, 0 (of 0) midpoints, 0 (of 0) tails
br04-7600-mtp02#show mpls traffic-eng fast-reroute database
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Protected tunnel In-label Out intf/label FRR intf/label Status
Tunnel50 Tun hd Gi3/2:implicit-n Tu51:implicit-nu Ready
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LSP identifier In-label Out intf/label FRR intf/label Status
P2MP Sub-LSP FRR information:
*Sub-LSP identifier
src_lspid[subid]->dst_tunid In-label Out intf/label FRR intf/label Status
* Sub-LSP identifier format: _[SubgroupID]->_
Note: Sub-LSP identifier may be truncated.
Use 'detail' display for the complete key.
br04-7600-mtp02#show mpls traffic-eng tunnels backup
br04-7600-mtp02_t51
LSP Head, Admin: up, Oper: up
Tun ID: 51, LSP ID: 35, Source: 94.103.128.59
Destination: 94.103.128.56
Fast Reroute Backup Provided:
Protected i/fs: Gi3/2
Protected LSPs/Sub-LSPs: 1, Active: 0
Backup BW: any pool unlimited; inuse: 0 kbps
Backup flags: 0x0
*Here the output from br01
br01-7600-par01#show mpls traffic-eng tunnels brief
Signalling Summary:
LSP Tunnels Process: running
Passive LSP Listener: running
RSVP Process: running
Forwarding: enabled
Periodic reoptimization: every 3600 seconds, next in 2489 seconds
Periodic FRR Promotion: Not Running
Periodic auto-bw collection: every 300 seconds, next in 89 seconds
P2P TUNNELS/LSPs:
TUNNEL NAME DESTINATION UP IF DOWN IF STATE/PROT
br01-7600-par01_t50 94.103.128.59 - Gi3/1 up/up
br01-7600-par01_t51 94.103.128.59 - Gi3/2 up/up
br04-7600-mtp02_t50 94.103.128.56 Gi3/1 - up/up
br04-7600-mtp02_t51 94.103.128.56 Gi3/2 - up/up
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P2MP TUNNELS:
Displayed 0 (of 0) P2MP heads
P2MP SUB-LSPS:
Displayed 0 P2MP sub-LSPs:
0 (of 0) heads, 0 (of 0) midpoints, 0 (of 0) tails
br01-7600-par01#show mpls traffic-eng fast-reroute database
P2P Headend FRR information:
Protected tunnel In-label Out intf/label FRR intf/label Status
Tunnel50 Tun hd Gi3/1:implicit-n Tu51:implicit-nu Ready
P2P LSP midpoint frr information:
LSP identifier In-label Out intf/label FRR intf/label Status
P2MP Sub-LSP FRR information:
*Sub-LSP identifier
src_lspid[subid]->dst_tunid In-label Out intf/label FRR intf/label Status
* Sub-LSP identifier format: _[SubgroupID]->_
Note: Sub-LSP identifier may be truncated.
Use 'detail' display for the complete key.
br01-7600-par01#show mpls traffic-eng tunnels backup
br01-7600-par01_t51
LSP Head, Admin: up, Oper: up
Tun ID: 51, LSP ID: 30, Source: 94.103.128.56
Destination: 94.103.128.59
Fast Reroute Backup Provided:
Protected i/fs: Gi3/1
Protected LSPs/Sub-LSPs: 1, Active: 0
Backup BW: any pool unlimited; inuse: 0 kbps
Backup flags: 0x0
Thx,
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Facing issues in MV with a simple join for FAST Refresh.
2 sample Tables:
1. employee
empid integer PK
empname varchar(50)
deptid integer FK
2. delta_employee
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empname varchar(50)
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Thanks,
J KumarFound a solution,
As per oracle documentation rowid fileds should be included in the Select statement. Even though I included the rowid fields, empid in this case it still didnt work.
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AS
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from work.employee e, work.delta_employee d
where e.empid = d.empid;
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