Tag Archives: L2VPN

EVPN in JunOS

Hi All

This time we will be looking at EVPN, its configuration on JunOS and how it is different from VPLS.

Currently if service provider has to join customer’s multiple sites via Layer 2, only option is VPLS. VPLS can be LDP based or BGP based.

BGP based VPLS has advantages that you can use RRs to scale however VPLS as a whole has a disadvantages that:

  • We can’t do active-active multihoming with both links from CE to PE.
  • Control plane MAC-Learning is not possible.
  • L2 Loop detection is not possible.
  • VPLS consumes less in control plane however more MPLS labels (because MAC learning relies on a different label for each remote site) than EVPN.

EVPN is immune to all the above problems and it’s only based upon BGP so we don’t have to fight between LDP vs BGP advantages.

Underlying EVPN can be used with VXLAN or MPLS however solution which I am going to discuss is based upon MPLS.

Look at the diagram below. We have 3 sites basically 3 VMs all part of same IP Network and they are connected to same EVPN instances on 3 different Juniper routers via switch in their path.

EVPN
EVPN Topology

Let’s see config on Manchester Juniper PE router.

You can see its fairly straightforward config with same parameters as L3VPNs except instance-type is evpn and we need to use protocols evpn to define parameters to limit the mac and ip if we want.

write@re1.Manchester > show configuration routing-instances evpn-1
instance-type evpn;
vlan-id 1200;
interface xe-1/0/0:0.1200;
route-distinguisher 10.198.206.41:1200;
vrf-target target:2856:1200;
protocols {
 evpn {
 interface-mac-limit {
 1000;
 packet-action drop;
 }
 interface-mac-ip-limit {
 1000;
 }
 interface xe-1/0/0:0.1200;
 label-allocation per-instance;
 }
}

From RR point of view, we need to add family evpn under BGP on all PEs and RR.

write@re1.Manchester > show configuration protocols bgp
path-selection external-router-id;
advertise-from-main-vpn-tables;
log-updown;
drop-path-attributes 128;
authentication-algorithm md5;
vpn-apply-export;
tcp-mss 4096;
group LAB-RR {
 type internal;
 local-address 10.198.206.41;
 family inet-vpn {
 unicast;
 family l2vpn {
 signaling;
 }
 family evpn {
 signaling;
 }
 neighbor 10.198.206.46;
}

We will be doing the same configs on rest 2 PEs.

write@re1.Manchester > show evpn instance evpn-1 extensive
Instance: evpn-1
 Route Distinguisher: 10.198.206.41:1200
 VLAN ID: 1200
 Per-instance MAC route label: 119
 Per-instance multicast route label: 120
 Duplicate MAC detection threshold: 5
 Duplicate MAC detection window: 180
 MAC database status Local Remote
 MAC advertisements: 1 2
 MAC+IP advertisements: 1 2
 Default gateway MAC advertisements: 0 0
 Number of local interfaces: 3 (3 up)
 Interface name ESI Mode Status AC-Role
 et-1/1/0.1200 00:00:00:00:00:00:00:00:00:00 single-homed Up Root
 xe-1/0/0:0.1200 00:00:00:00:00:00:00:00:00:00 single-homed Up Root
 xe-1/0/0:0.1210 00:00:00:00:00:00:00:00:00:00 single-homed Up Root
 Number of IRB interfaces: 0 (0 up)
 Number of protect interfaces: 0
 Number of bridge domains: 1
 VLAN Domain ID Intfs / up IRB intf Mode MAC sync IM route label SG sync IM core nexthop
 1200 3 3 Extended Enabled 120 Enabled
 Number of neighbors: 4
 Address MAC MAC+IP AD IM ES Leaf-label
 10.198.206.42 0 0 0 1 0
 10.198.206.43 1 1 0 1 0
 10.198.206.44 0 0 0 1 0
 10.198.206.45 1 1 0 1 0
 Number of ethernet segments: 0

Some key take away from above is that due to config “label-allocation per-instance” we are seeing one MPLS Label for the whole EVPN routing instance.

write@re1.Manchester > show route table mpls.0 label 119
mpls.0: 45 destinations, 45 routes (45 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

119 *[EVPN/7] 3d 20:05:21, routing-instance evpn-1, route-type Ingress-MAC, vlan-id 1200
 to table evpn-1.evpn-mac.0

ESI (Ethernet Segment Identifier) is all zeros for PE which is single homed to CE. In active-active multihoming, an Ethernet segment appears as a LAG to the CE device.

Let’s check the mac-table on PE. So you can see   00:0c:29:34:04:26 is learned dynamically by Manc PE over xe-1/0/0:0/1200 interface. This is still Data Plane learning and with EVPN there is no difference. However look at MAC Flags for other 2 MAC addresses. DC corresponds to Dynamic Control MAC means they are learned via Control Plane (using BGP)

write@re1.Manchester > show evpn mac-table instance evpn-1
MAC flags       (S -static MAC, D -dynamic MAC, L -locally learned, C -Control MAC
O -OVSDB MAC, SE -Statistics enabled, NM -Non configured MAC, R -Remote PE MAC, P -Pinned MAC)
Routing instance : evpn-1
Bridging domain : __evpn-1__, VLAN : 1200
MAC                         MAC      Logical          NH     MAC         active
address                    flags    interface        Index  property    source
00:0c:29:34:04:26   D        xe-1/0/0:0.1200
00:0c:29:37:55:3d   DC                        1048585            10.198.206.43
00:0c:29:55:5a:45   DC                        1048584            10.198.206.45

Evpn has also learned the IP Address and added in arp-table so you can see MAC/IP Association.

write@re1.Manchester > show evpn arp-table instance evpn-1
INET MAC Logical Routing Bridging
address address interface instance domain
10.10.10.3 00:0c:29:34:04:26 xe-1/0/0:0.1200 evpn-1 __evpn-1__
10.10.10.4 00:0c:29:37:55:3d evpn-1 __evpn-1__
10.10.10.2 00:0c:29:55:5a:45 evpn-1 __evpn-1__

Same thing you can see in routing table as well.

There are several types of routes in EVPN, Type 1, 2, 3, 5, 6 etc.. Type 2 is MAC and IP Route which shows relationship between them however Junos shows that also in 2 ways. Type 2 route as pure MAC and type 2 route as MAC/IP.

Type 3 routes are required for Broadcast, Unknown Unicast and Multicast (BUM) traffic delivery across EVPN networks. Type 3 advertisements provide information about P-tunnels that should be used to send BUM traffic. Without Type 3 advertisements, ingress router would not know how to deliver BUM traffic to other PE devices that comprise given EVPN instance.

write@re1.Manchester > show route table evpn-1
evpn-1.evpn.0: 11 destinations, 11 routes (11 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

2:10.198.206.41:1200::1200::00:0c:29:34:04:26/304 MAC/IP
 *[EVPN/170] 3d 19:18:39
 Indirect
2:10.198.206.43:1200::1200::00:0c:29:37:55:3d/304 MAC/IP
 *[BGP/170] 1d 02:03:17, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.2 via xe-0/0/0:1.0
2:10.198.206.45:1200::1200::00:0c:29:55:5a:45/304 MAC/IP
 *[BGP/170] 03:13:24, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.14 via et-0/1/0.0, Push 945
2:10.198.206.41:1200::1200::00:0c:29:34:04:26::10.10.10.3/304 MAC/IP
 *[EVPN/170] 3d 19:18:34
 Indirect
2:10.198.206.43:1200::1200::00:0c:29:37:55:3d::10.10.10.4/304 MAC/IP
 *[BGP/170] 01:53:03, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.2 via xe-0/0/0:1.0
2:10.198.206.45:1200::1200::00:0c:29:55:5a:45::10.10.10.2/304 MAC/IP
 *[BGP/170] 03:13:24, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.14 via et-0/1/0.0, Push 945
3:10.198.206.41:1200::1200::10.198.206.41/248 IM
 *[EVPN/170] 6d 22:17:38
 Indirect
3:10.198.206.42:1200::1200::10.198.206.42/248 IM
 *[BGP/170] 03:13:24, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.14 via et-0/1/0.0
3:10.198.206.43:1200::1200::10.198.206.43/248 IM
 *[BGP/170] 1d 02:03:17, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.2 via xe-0/0/0:1.0
3:10.198.206.44:1200::1200::10.198.206.44/248 IM
 *[BGP/170] 1d 02:03:17, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.6 via xe-0/0/0:2.0
3:10.198.206.45:1200::1200::10.198.206.45/248 IM
 *[BGP/170] 03:13:24, localpref 100, from 10.198.206.46
 AS path: I, validation-state: unverified
 > to 30.30.30.14 via et-0/1/0.0, Push 945

 

Let’s do a ping test from VM (10.10.10.4) connected to London to VM (10.10.10.3) connected to Manchester PE via EVPN Network.

For completeness, I have shown the arp-table for London EVPN-1.

write@re0.London > show evpn arp-table instance evpn-1
INET MAC Logical Routing Bridging
address address interface instance domain
10.10.10.3 00:0c:29:34:04:26 evpn-1 __evpn-1__
10.10.10.4 00:0c:29:37:55:3d xe-0/2/0.1200 evpn-1 __evpn-1__
10.10.10.2 00:0c:29:55:5a:45 evpn-1 __evpn-1__

You can see Ping works without any loss.

Ping

So that’s all for EVPN. Let me know if you have any queries and I hope to show you more in next blogs about EVPN.

BBye 🙂

Mohit

Advertisements

L2VPN using Kompella – Junos

In my earlier blog on L2VPN via CCC https://networkzblogger.com/2017/04/23/l2vpn-via-ccc-in-junos/ we saw in that method customer interface needs to be bind with LSP and for each customer we need to have separate LSP configured which is not ideal from operational perspective. In this blog we will look at another method of achieving this where BGP is used as signalling protocol which automates the connections, so manual configuration of the association between the LSP and the customer edge interface is not required.

This config is also called Kompella after its author (https://tools.ietf.org/html/draft-kompella-l2vpn-l2vpn-00) where BGP is used to signal the control plane and it uses a two label stack as Martini. The VC (VPN) label is signalled via BGP and transport label can be signaled via either RSVP or LDP.

We would be looking at below topology where we will be configuring the MPLS L2VPN or Juniper L2CIRCUIT between M10i and MX960 PEs. M320s in between are just acting as Transit P/PE nodes and no configuration specifically needed on them for L2VPN however normal RSVP/LDP/MPLS/IGP config needs to be configured for transport label same as how L3VPN works.

L2VPN Kompella

MX104s are acting as RR so BGP neighborship will appropriate family needs to be activated between PEs-RRs.

For BGP based L2VPNs, following configuration needs to be configured

  1. BGP group with family l2vpn signalling
  2. Routing instance using instance type “l2vpn”
  3. Ethernet link needs to be established with Customer and same needs to be defined under Routing-instance.

Let’s start with Juniper l2vpn configuration.

First BGP Group where l2vpn signalling family needs to be enabled for PE-RR group.

BGP neighborship between M10i and one of the RR.

M10i-PE> show configuration protocols bgp group L2VPN-RRs
type internal;
family l2vpn {
    signaling;
}
authentication-algorithm md5;
authentication-key-chain BGP-L2VPN-key-chain;
neighbor 10.198.123.234;  <<<<<<<<< Loopback of RR1
neighbor 10.198.123.237;  <<<<<<<<< Loopback of RR2

BGP neighborship between M10i and one of the RR.

M10i-PE > show bgp neighbor 10.198.123.234
Peer: 10.198.123.234+179 AS 65004 Local: 10.198.123.213+50453 AS 65004
 Group: L2VPN-RRs Routing-Instance: master
 Type: Internal State: Established Flags: <Sync>
 Options: <Preference LocalAddress GracefulRestart LogUpDown AddressFamily Rib-group Refresh>
 Address families configured: l2vpn-signaling
 Local Address: 10.198.123.213 Holdtime: 90 Preference: 170
 Peer ID: 10.198.123.234 Local ID: 10.198.123.213 Active Holdtime: 90
 NLRI for restart configured on peer: l2vpn
 NLRI advertised by peer: l2vpn
 NLRI for this session: l2vpn
 Peer supports Refresh capability (2)
 Restart time configured on the peer: 120
 Stale routes from peer are kept for: 300
 Restart time requested by this peer: 120
 NLRI that peer supports restart for: l2vpn
 NLRI peer can save forwarding state: l2vpn
 NLRI that peer saved forwarding for: l2vpn
 NLRI that restart is negotiated for: l2vpn
 NLRI of received end-of-rib markers: l2vpn
 NLRI of all end-of-rib markers sent: l2vpn.
.
.

Even though customer facing config is not part of MPLS L2VPN, I will define it here which is using l2vpn encapsulation vlan-ccc.

M10i-PE > show configuration interfaces fe-0/1/1
description "Connected to CE-1";
vlan-tagging;
link-mode full-duplex;
encapsulation vlan-ccc;
unit 2 {
 encapsulation vlan-ccc;
 vlan-id 1001;
 family ccc;
}

Fairly simple configuration which is using encapsulation vlan-ccc.

OK, lets move to 2nd and 3rd part which is routing-instance configuration. I have highlighted important bits below. Off course for this L2VPN type you need to define RD, RT, and Interface which I am not mentioning specifically but you can see below.

M10i-PE > show configuration routing-instances L2VPN
instance-type l2vpn;
interface fe-0/1/1.2;
route-distinguisher 10.198.123.213:2;
vrf-target target:65004:2;
protocols {
 l2vpn {
 encapsulation-type ethernet-vlan;
 site Audi {
 site-identifier 2;
 interface fe-0/1/1.2 {
 remote-site-id 3;
 }
 }
 }
}

Important bit is instance-type l2vpn which enables this routing-instance for L2VPN. Under protocols l2vpn we have to enable the encap type as ethernet-vlan and then under site parameters we need to be define local site-identifier which is in our case is 2 and an optional remote-site-id. I have defined remote-site-id as 3 which will be configured on MX960 Remote-PE as its local site-identifier.

In same way we will be configuring the MX960 PE

MX960-PE> show configuration interfaces ge-1/1/9.700
encapsulation vlan-ccc;
vlan-id 700;
family ccc;

MX960-PE> show configuration routing-instances L2VPN
instance-type l2vpn;
interface ge-1/1/9.700;
route-distinguisher 10.198.123.205:3;
vrf-target target:65004:2;
protocols {
 l2vpn {
 encapsulation-type ethernet-vlan;
 site Bentley {
 site-identifier 3;
 interface ge-1/1/9.700 {
 remote-site-id 2;
 }
 }
 }
}

Once this is configured, let’s check the routing table on M10i

M10i-PE > show route table L2VPN.l2vpn.0
L2VPN.l2vpn.0: 3 destinations, 5 routes (3 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both

10.198.123.205:3:3:1/96 <<<<<<<<<------------ Learnt from MX960
 *[BGP/170] 13:56:58, localpref 100, from 10.198.123.237
 AS path: I, validation-state: unverified
 > via so-0/0/0.0, Push 299888
 [BGP/170] 13:56:58, localpref 100, from 10.198.123.234
 AS path: I, validation-state: unverified
 > via so-0/0/0.0, Push 299888
.
.
.
10.198.123.213:2:2:3/96 <<<<<<<<-------------- Local route on M10i
 *[L2VPN/170/-101] 16:56:08, metric2 1
 Indirect

This output is showing us RD value of 10.198.123.205:3 plus value of remote-side identifier which is 3 as well plus label-offset value which is 1

In same way, local route has RD value of 10.198.123.213:2 plus value of remote-side identifier which is 2 and label-offset value of 3. Will explain label-offset later.

So this completes our BGP control signalling path.

L2VPN connection state is up between both PEs

M10i-PE > show l2vpn connections up
Layer-2 VPN connections:

Instance: L2VPN
Edge protection: Not-Primary
 Local site: Audi (2)
 connection-site Type St Time last up # Up trans
 3               rmt  Up May 2 20:53:51 2017 1
 Remote PE: 10.198.123.205, Negotiated control-word: Yes (Null)
 Incoming label: 800006, Outgoing label: 800003
 Local interface: fe-0/1/1.2, Status: Up, Encapsulation: VLAN

Now we can move over to forwarding path where we will see MPLS labels. As in case of L3VPNs, we have 2 Labels on each packet i.e. VPN Label and other is transport label.

Transport label is calculated in same way where label is assigned for next-hop which in our case is remote-PE MX960 loopback address and this label can be learnt by any method LDP or RSVP and will be advertised to M10i PE by its immediate neighbour which in our case is M320.

So to check the label stack which is being pushed at M10i, we can see the MPLS.0 table.

M10i-PE > show route table mpls.0
mpls.0: 25 destinations, 25 routes (25 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both
.
.
.
fe-0/1/1.2 *[L2VPN/7] 14:27:18, metric2 1
 > via so-0/0/0.0, Push 800003, Push 299888(top) Offset: 252

So you can see two labels are being pushed, TOP (transport) label is 299888 which is advertised by M320

M320-Transit-P-1> show ldp database session 10.198.123.213
.
.

Output label database, 10.198.123.202:0--10.198.123.213:0
 Label Prefix
 306336 10.198.123.100/32
 299808 10.198.123.201/32
 3      10.198.123.202/32
 299792 10.198.123.203/32
 308832 10.198.123.204/32
 299888 10.198.123.205/32
 304288 10.198.123.211/32

VPN Label is 800003 which is calculated little bit differently in case of L2VPNs and not directly advertised by Remote-Pes.

Formula to calculate VPN label is

L2VPN label = Label-Base (remote) + Site-Id(Local) – Label-Offset (remote)

Label-base (remote) value is what we can get from MX960 by looking at its L2VPN.l2vpn table

MX960-PE > show route table L2VPN.l2vpn.0 extensive
L2VPN.l2vpn.0: 3 destinations, 5 routes (3 active, 0 holddown, 0 hidden)
.
.
 Advertised metrics:
 Flags: Nexthop Change
 Nexthop: Self
 Localpref: 100
 AS path: [65004] I
Path 10.198.123.205:3:3:1 Vector len 4. Val: 0
 *L2VPN Preference: 170/-101
 Next hop type: Indirect, Next hop index: 0
 Address: 0xa5d246c
.
.
.
 Label-base: 800002, range: 2, status-vector: 0x0, offset: 1
 Secondary Tables: L2VPN.l2id.0

You can see above that label-base is 800002 on MX960 and Label-offset value is 1

So as per our equation above,

L2VPN Label = 800002 + 2 (Site-id local on M10i)  – 1  = 800003

Once this VPN Label reaches MX960, it is pop as per normal MPLS procedures and out to CE-2 interface.

800003 *[L2VPN/7] 14:37:16
 > via ge-1/1/9.700, Pop Offset: 4

In same way, MX960 will also calculate the VPN label for traffic flowing from MX960 to M10i.

So that’s all for this blog. I hope you enjoyed it and let me know if you still have any issues.

 

Regards

Mohit Mittal


L2VPN via CCC in Junos!!!!

L2VPNs are another type of VPNs which Service providers have in their kitty to connect their customers over its MPLS environment. With L2VPNs, service providers extend the Customer LAN over the SP network and customer don’t have any idea that they are connected over the MPLS network. There are many variants of L2VPNs and majority of them use LDP/BGP schemes to configure this. However first method which was implemented for carrying layer 2 traffic over a MPLS network was CCC (Circuit Cross Connect) which we will talk here and still being used by many SPs to connect their customers.

CCC scheme always use an RSVP Signaled LSP which has advantage of taking Traffic Engineering properties of RSVP. For each connection between Customers we need to have a dedicated LSP which is different from LDP/BGP schemes which use same Transport LSP to send the traffic E2E.

As we have dedicated LSP between 2 End Point PEs, there is no concept of VPN Label to associate the corresponding VRF/Customer interface in case of CCC scheme. Also in CCC, as there is only label E2E, we need to disable the PHP (Penultimate Hop Popping) so that Penultimate Hop Router doesn’t Pop the label which would otherwise send plain Ethernet Frame to Egress PE and PE won’t be knowing what to do with this.

For a point-to-point CCC connection, the connection is bidirectional, so an RSVP-signaled LSP is required in each direction between the two PEs.

We will look at configuration of L2VPN via CCC method on Junos where we will use the below Network to configure it.

VPN CCC Model

As the connection needs to be bidirectional, we will only look at the forwarding path from Left to right however other direction would be using the same method.

On Ingress side, Customer CE-1 is connected to ge-0/1/8/.601 interface on MX104 PE and interface config would be:

Re1@Ingress_PE> show configuration interfaces ge-0/1/8
description "Connected to Customer CE-1";
vlan-tagging;
mtu 1522;
encapsulation vlan-ccc;
unit 601 {
    encapsulation vlan-ccc;
    vlan-id 601;
    family ccc;
}

Vlans 512-4094 are only reserved for vlan-ccc encapsulation so you need to use vlan greater than equal to 512.

On Egress side, Customer CE-2 is connected to xe-2/0/0.601 interface on MX960 PE and interface config would be:

Re1@Egress_PE> show configuration interfaces xe-2/0/0
description "Connected to Customer CE-2";
vlan-tagging;
mtu 1522;
encapsulation vlan-ccc;
unit 601 {
 encapsulation vlan-ccc;
 vlan-id 601;
 family ccc;
}

Next config is to create a Label switched path from Ingress to Egress with an optional strict ‘path’ to fully utilize the TE properties otherwise router will dynamically calculate the path towards Egress.

In our case, we have defined the path

So LSP from Ingress MX104 PE to Egress PE MX960 via Transit PE looks like:

Re1@Ingress_PE > show configuration protocols mpls label-switched-path MX104-MX960
to 10.198.123.205;
bandwidth 100m;
optimize-timer 900;
preference 200;
priority 5 0;
primary MX104-MX960; <<<<< Path

Re1@Ingress_PE > show mpls lsp name MX104-MX960
Ingress LSP: 11 sessions
To             From           State Rt P ActivePath LSPname
10.198.123.205 10.198.123.100 Up    0 * MX104-MX960 MX104-MX960
Total 1 displayed, Up 1

LSP is Up and everything looks fine from Ingress to Egress. In same way we have to configure the LSP from MX960 to MX104 in other direction. Once both LSPs are up, we have to bind these LSPs and Ingress Interface under one connection on MX104 and same way in MX960.

Lets check on MX104 Ingress

Re1@Ingress_PE > show configuration protocols connections remote-interface-switch L2VPN
interface ge-0/1/8.601;
transmit-lsp MX104-MX960; 
receive-lsp MX960-MX104;  

Once we have configured this on both sides, we should have this connection Up and running. Lets check this.

Re1@Ingress_PE > show connections remote-interface-switch L2VPN
CCC and TCC connections [Link Monitoring On]
Legend for status (St): Legend for connection types:
 UN -- uninitialized if-sw: interface switching
 NP -- not present rmt-if: remote interface switching
 WE -- wrong encapsulation lsp-sw: LSP switching
 DS -- disabled tx-p2mp-sw: transmit P2MP switching
 Dn -- down rx-p2mp-sw: receive P2MP switching
 -> -- only outbound conn is up Legend for circuit types:

So we have UP state once config is done on both sides. Our L2VPN is ready to accept and switch the traffic to egress. For any chance if there is any issue in config like vlan-mismatch on other end or LSP is down because of any reason like path or Bandwidth issue, connection won’t be up and we can see from the various legend from the command output showing exactly where is the issue.

Now as Control plane is configured, let’s check how Forwarding plane looks like.

Lets see the label which has been allocated by Ingress PE for this LSP.

Re1@Ingress_PE > show rsvp session ingress up name MX104-MX960
Ingress RSVP: 11 sessions
To             From           State Rt Style Labelin Labelout LSPname
10.198.123.205 10.198.123.100 Up    0 1 FF         - 307680   MX104-MX960
Total 1 displayed, Up 1, Down 0

Re1@Ingress_PE > show route table mpls.0 label-switched-path MX104-MX960 extensive
mpls.0: 25 destinations, 25 routes (25 active, 0 holddown, 0 hidden)
Restart Complete
ge-0/1/8.601 (1 entry, 1 announced)
TSI:
KRT in-kernel ge-0/1/8.601.0 /32 -> {Push 307680}
 *CCC Preference: 200/1
 Next hop type: Router, Next hop index: 829
 Address: 0x2b4c224
 Next-hop reference count: 2
 Next hop: 10.0.0.169 via ge-0/0/1.0 weight 0x1, selected
 Label-switched-path MX104-MX960
 Label operation: Push 307680
 Label TTL action: no-prop-ttl
 Session Id: 0x3
 State: 
 Local AS: 65004
 Age: 19:10 Metric: 328
 Validation State: unverified
 Task: MPLS
 Announcement bits (1): 0-KRT
 AS path: I

Lets look at Transit PE-1. As you can see below, Label from MX104 Ingress is being swapped here with 300928.

Re1@Transit-PE-1> show rsvp session transit name MX104-MX960
Transit RSVP: 13 sessions
To             From           State Rt Style Labelin Labelout LSPname
10.198.123.205 10.198.123.100 Up 0 1 FF      307680  300928 MX104-MX960
Total 1 displayed, Up 1, Down 0

Similarly on Transit PE-2

Re1@Transit-PE-2> show rsvp session transit name MX104-MX960
Transit RSVP: 7 sessions
To             From           State Rt Style Labelin Labelout LSPname
10.198.123.205 10.198.123.100 Up 0 1 FF      300928  300427  MX104-MX960
Total 1 displayed, Up 1, Down 0

At Egress PE,

Re1@Egress-PE> show rsvp session egress up name MX104-MX960
Egress RSVP: 29 sessions
To             From           State Rt Style Labelin Labelout LSPname
10.198.123.205 10.198.123.100 Up 0 1 FF      300427  -        MX104-MX960
Total 1 displayed, Up 1, Down 0

Re1@Egress-PE> show route table mpls.0 label 300427 extensive
mpls.0: 81 destinations, 81 routes (81 active, 0 holddown, 0 hidden)
Restart Complete
300427 (1 entry, 1 announced)
TSI:
KRT in-kernel 300427 /52 -> {Pop }
 *CCC Preference: 7
 Next hop type: Router, Next hop index: 1725
 Address: 0xe9414fc
 Next-hop reference count: 2
 Next hop: via xe-2/0/0.601, selected
 Label operation: Pop
 Load balance label: None;
 Label element ptr: 0xa7c8780
 Label parent element ptr: 0x0
 Label element references: 20
 Label element child references: 0
 Label element lsp id: 0
 Session Id: 0x0
 State: 
 Local AS: 65004
 Age: 2d 2:21:13
 Validation State: unverified
 Task: MPLS global
 Announcement bits (1): 1-KRT
 AS path: I

Just to confirm this all, you can use the below command on Ingress/Egress PE which shows what all labels being pushed and used for this LSP via CCC.

Re1@Ingress_PE > show connections remote-interface-switch L2VPN labels
CCC and TCC connections [Link Monitoring On]
Legend for status (St): Legend for connection types:
 UN -- uninitialized if-sw: interface switching
 NP -- not present rmt-if: remote interface switching
 WE -- wrong encapsulation lsp-sw: LSP switching
 DS -- disabled tx-p2mp-sw: transmit P2MP switching
 Dn -- down rx-p2mp-sw: receive P2MP switching
 -> -- only outbound conn is up Legend for circuit types:
  Outgoing labels: Push 307680

Re1@Egress_PE > show connections remote-interface-switch L2VPN labels
CCC and TCC connections [Link Monitoring On]
Legend for status (St): Legend for connection types:
 UN -- uninitialized if-sw: interface switching
 NP -- not present rmt-if: remote interface switching
 WE -- wrong encapsulation lsp-sw: LSP switching
 DS -- disabled tx-p2mp-sw: transmit P2MP switching
 Dn -- down rx-p2mp-sw: receive P2MP switching
 -> -- only outbound conn is up Legend for circuit types:
  Incoming labels: 300427
 Outgoing labels: Push 301040

Others labels shown in above commands are for opposite direction from Egress to Ingress.

So that’s all for L2VPN CCC. I hope I have been able to clear your doubts if you had any. if you have any queries, please let me know. In future blogs, we will discuss other methods of doing L2VPN.

Regards

Mohit