<s>
An	O
egress	B-General_Concept
router	I-General_Concept
is	O
a	O
Label	B-Protocol
Switch	I-Protocol
Router	I-Protocol
that	O
is	O
an	O
end	O
point	O
(	O
drain	O
)	O
for	O
a	O
given	O
Label	O
Switched	O
Path	O
(	O
LSP	O
)	O
.	O
</s>
<s>
An	O
egress	B-General_Concept
router	I-General_Concept
may	O
be	O
an	O
ingress	B-General_Concept
router	I-General_Concept
or	O
an	O
intermediate	O
router	O
for	O
any	O
other	O
LSP(s )	O
.	O
</s>
<s>
Hence	O
the	O
role	O
of	O
egress	O
and	O
ingress	B-General_Concept
routers	I-General_Concept
is	O
LSP	O
specific	O
.	O
</s>
<s>
Usually	O
,	O
the	O
MPLS	B-Protocol
label	O
is	O
attached	O
with	O
an	O
IP	O
packet	O
at	O
the	O
ingress	B-General_Concept
router	I-General_Concept
and	O
removed	O
at	O
the	O
egress	B-General_Concept
router	I-General_Concept
,	O
whereas	O
label	O
swapping	O
is	O
performed	O
on	O
the	O
intermediate	O
routers	O
.	O
</s>
